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Benzeni

Benzeni

I benzene sono semplici idrocarburi aromatici costituiti da un anello di carbonio a sei membri con doppi legami alternati. Questa struttura fondamentale è un blocco costitutivo per numerosi composti chimici, inclusi prodotti farmaceutici, polimeri e coloranti. I benzene sono ampiamente utilizzati nella sintesi organica grazie alla loro stabilità e versatilità. Presso CymitQuimica, offriamo un'ampia gamma di benzene di alta qualità per supportare le vostre ricerche e applicazioni industriali.

Sottocategorie di "Benzeni"

Trovati 11887 prodotti di "Benzeni"

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  • 3-(Methylamino)benzonitrile

    CAS:
    Formula:C8H8N2
    Purezza:98%
    Peso molecolare:132.166

    Ref: 10-F335879

    1g
    63,00€
    250mg
    25,00€
  • 2,4,6-Tris(diphenylamino)-3,5-difluorobenzonitrile

    CAS:
    Purezza:96%
    Colore e forma:Solid
    Peso molecolare:640.7379761

    Ref: 10-F617111

    1g
    148,00€
    5g
    636,00€
    100mg
    23,00€
    250mg
    46,00€
  • 3,5-Dinitrobenzyl alcohol

    CAS:
    Formula:C7H6N2O5
    Purezza:98%
    Colore e forma:Solid
    Peso molecolare:198.134

    Ref: 10-F222754

    5g
    31,00€
    25g
    110,00€
  • Anisole, 99%

    CAS:
    <p>Anisole is widely used as a solvent for the synthesis of various organic compounds, anethole, nonylphenol isomer 4-(3',6'-dimethyl-3-heptyl)phenol, perfumes, insect pheromones and pharmaceuticals. It finds application in the preparation of inorganic complexes and materials such as tin-core/tin oxide</p>
    Formula:C7H8O
    Purezza:99%
    Colore e forma:Clear colorless, Liquid
    Peso molecolare:108.14

    Ref: 02-A12997

    500g
    47,00€
    2500g
    Prezzo su richiesta
  • 4,4'-cis-Stilbenedicarboxylic acid, 95%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C16H12O4
    Purezza:95%
    Colore e forma:White to cream to yellow, Powder or granular powder or flakes
    Peso molecolare:268.27

    Ref: 02-L04364

    1g
    Prezzo su richiesta
    5g
    Prezzo su richiesta
  • 2,5-Difluorobenzyl bromide, 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C7H5BrF2
    Purezza:98%
    Colore e forma:Clear colorless, Liquid
    Peso molecolare:207.02

    Ref: 02-B20752

    10g
    Prezzo su richiesta
    50g
    Prezzo su richiesta
    2500mg
    Prezzo su richiesta
  • 4-Chloroanisole, 99%

    CAS:
    <p>4-Chloroanisole was found to react with Cu (II)-smectite forming a blue clay-organic complex. 4-Chloroanisole was chosen as the main test substrate for the optimisation studies as it is electronically deactivated and thus resistant to oxidative addition and consequently very reluctant to enter a cat</p>
    Formula:C7H7ClO
    Purezza:99%
    Colore e forma:Clear colorless, Liquid
    Peso molecolare:142.58

    Ref: 02-A11377

    50g
    45,00€
    250g
    159,00€
  • 4-Methoxybenzonitrile, 99%

    CAS:
    <p>4-Methoxybenzonitrile is used as raw material of parfum. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has no</p>
    Formula:C8H7NO
    Purezza:99%
    Colore e forma:White to pale cream to cream to yellow, Crystals or powder or crystalline powder
    Peso molecolare:133.15

    Ref: 02-A15945

    5g
    39,00€
    25g
    Prezzo su richiesta
    100g
    265,00€
  • 4-Methyl-3-nitrobenzenesulfonyl chloride, 95%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C7H6ClNO4S
    Purezza:95%
    Colore e forma:Crystals or powder or crystalline powder or fused solid, Cream to pale yellow
    Peso molecolare:235.64

    Ref: 02-A19931

    5g
    Prezzo su richiesta
    100g
    Prezzo su richiesta
  • 4-Bromo-3-fluoroaniline, 98%

    CAS:
    <p>4-Bromo-3-fluoroaniline is an intermediate used for the synthetic preparation of Tradizolid and various pharmaceuticals such as the synthesis of several lateral difluoro-substituted 4,4-dialkyl- and 4,4-alkoxyalkylterphenyls. This Thermo Scientific Chemicals brand product was originally part of the </p>
    Formula:C6H5BrFN
    Purezza:98%
    Colore e forma:White to cream to pale brown, Crystals or powder or crystalline powder
    Peso molecolare:190.02

    Ref: 02-B22227

    10g
    Prezzo su richiesta
    2500mg
    Prezzo su richiesta
  • 2-Hydroxy-4-iodobenzonitrile

    CAS:
    Purezza:98%
    Peso molecolare:245.0189972

    Ref: 10-F617303

    1g
    1.143,00€
  • 3,4-Difluoroanisole, 98%

    CAS:
    This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci
    Formula:C7H6F2O
    Purezza:98%
    Colore e forma:Liquid, Clear colorless
    Peso molecolare:144.12

    Ref: 02-A12474

    5g
    34,00€
    25g
    Prezzo su richiesta
  • Indapamide

    CAS:
    <p>Used as an antihypertensive. Diuretic This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part</p>
    Formula:C16H16ClN3O3S
    Peso molecolare:365.83

    Ref: 02-J63846

    1g
    46,00€
    5g
    144,00€
  • 4,4'-Methylenebis(N,N-dimethylaniline), 98+%

    CAS:
    <p>4,4'-Methylenebis(N,N-dimethylaniline)is used as a chemical intermediate in the manufacture of dyes and for its hydrochloric salt and is also used as an analytical reagent in the determination of lead. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portf</p>
    Formula:C17H22N2
    Purezza:98+%
    Colore e forma:White to cream or brown or blue to purple to gray, Crystals or powder or crystalline powder or fused solid or flakes
    Peso molecolare:254.38

    Ref: 02-A18466

    10g
    40,00€
    50g
    55,00€
    250g
    134,00€
  • 4-(Trifluoromethoxy)anisole, 98+%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C8H7F3O2
    Purezza:98+%
    Colore e forma:Clear colorless to pale yellow, Liquid
    Peso molecolare:192.14

    Ref: 02-A19746

    5g
    34,00€
    25g
    Prezzo su richiesta
  • 3,4-Dimethylbenzyl alcohol, 97%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C9H12O
    Purezza:97%
    Colore e forma:White to pale brown, Crystals or powder or crystalline powder
    Peso molecolare:136.19

    Ref: 02-B24926

    1g
    Prezzo su richiesta
    5g
    Prezzo su richiesta
    25g
    433,00€
  • 4-Allylanisole, 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C10H12O
    Purezza:98%
    Colore e forma:Clear colorless, Liquid
    Peso molecolare:148.21

    Ref: 02-B23311

    25g
    51,00€
    100g
    Prezzo su richiesta
  • 2-Bromo-5-methoxybenzonitrile, 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C8H6BrNO
    Purezza:98%
    Peso molecolare:212.05

    Ref: 02-H50608

    250mg
    Prezzo su richiesta
  • 2-Methylanisole, 99%

    CAS:
    <p>The catalytic system of disubstituted aromatics was optimized for the 2-methylanisole reduction by a proper choice of the amine/Rh ratio which should be high enough to stabilize very small colloidal rhodium particles and low enough to avoid deactivation. The total synthesis of ()-heliannuol D and it</p>
    Formula:C8H10O
    Purezza:99%
    Colore e forma:Clear colorless to pale yellow, Liquid
    Peso molecolare:122.17

    Ref: 02-A13897

    50g
    59,00€
    250g
    191,00€
  • 4,4&Prime;-Diamino-p-terphenyl, 95%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C18H16N2
    Purezza:95%
    Colore e forma:Pale cream to brown, Powder
    Peso molecolare:260.34

    Ref: 02-L05403

    1g
    Prezzo su richiesta
    5g
    360,00€
  • 3-(2-Methoxyphenoxy)-1,2-propanediol, 98+%

    CAS:
    <p>3-(2-Methoxyphenoxy)-1,2-propanediol is involved in centrally acting muscle relaxant with expectorant properties. It is often used as anesthetic during animal surgery. It is used in the treatment of coughing This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product</p>
    Formula:C10H14O4
    Purezza:98+%
    Colore e forma:White to pale cream, Powder or crystalline powder
    Peso molecolare:198.22

    Ref: 02-A16827

    1kg
    Prezzo su richiesta
    50g
    38,00€
    250g
    Prezzo su richiesta
  • α-Methylstyrene, 99%, stab. with 10-20 ppm 4-tert-butylcatechol

    CAS:
    <p>-Methylstyrene (AMS) is used in the synthesis of (acrylonitrile-styrene-acrylic copolymer)/(-methylstyrene-acrylonitrile copolymer). It is used in the manufacture of plasticizers, resins and polymers. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfo</p>
    Formula:C9H10
    Purezza:99%
    Colore e forma:Clear, colorless, Liquid
    Peso molecolare:118.18

    Ref: 02-L03609

    100ml
    Prezzo su richiesta
    500ml
    49,00€
    2500ml
    Prezzo su richiesta
  • Eugenol, 99%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C10H12O2
    Purezza:99%
    Colore e forma:Clear colorless to yellow, Liquid
    Peso molecolare:164.20

    Ref: 02-A14332

    100g
    39,00€
    500g
    137,00€
  • 4-(4-Methoxyphenyl)butyric acid, 98%

    CAS:
    <p>4-(4-Methoxyphenyl)butyric acid on demethylation with pyridinium hydrochloride affords 4-hydroxyphenylbutyric acid, a key starting material for the synthesis of preclinical candidate LY518674. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Som</p>
    Formula:C11H14O3
    Purezza:98%
    Colore e forma:Cream to pale yellow, Powder
    Peso molecolare:194.23

    Ref: 02-H60613

    1g
    Prezzo su richiesta
    5g
    Prezzo su richiesta
  • 4,5-Dichlorophthalonitrile

    CAS:
    Formula:C8H2Cl2N2
    Purezza:97%
    Colore e forma:Solid
    Peso molecolare:197.02

    Ref: 10-F219497

    1g
    30,00€
    5g
    96,00€
    10g
    165,00€
    25g
    263,00€
  • 3-Chloroanisole, 98+%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C7H7ClO
    Purezza:98+%
    Colore e forma:Clear colorless to pale yellow, Liquid
    Peso molecolare:142.58

    Ref: 02-A17327

    50g
    62,00€
    250g
    Prezzo su richiesta
  • 2-Iodo-5-nitrobenzoic acid

    CAS:
    Formula:C7H4INO4
    Purezza:98%
    Colore e forma:Solid
    Peso molecolare:293.016

    Ref: 10-F212982

    1g
    28,00€
    5g
    72,00€
    10g
    126,00€
    25g
    278,00€
  • 4-Cyanophenylacetonitrile, 97%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C9H6N2
    Purezza:97%
    Peso molecolare:142.16

    Ref: 02-H54112

    1g
    60,00€
    5g
    Prezzo su richiesta
  • 2-Chloro-5-nitrobenzoyl chloride, 96%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C7H3Cl2NO3
    Purezza:96%
    Colore e forma:White to cream to yellow to brown, Crystals or powder or crystalline powder
    Peso molecolare:220.01

    Ref: 02-L17523

    25g
    Prezzo su richiesta
  • Benzyl (3-bromo-5-nitrophenyl)carbamate

    CAS:
    Formula:C14H11BrN2O4
    Purezza:95%
    Colore e forma:Solid
    Peso molecolare:351.156

    Ref: 10-F213593

    1g
    21,00€
  • 4-Hydroxy-3-methoxybenzonitrile, 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C8H7NO2
    Purezza:98%
    Colore e forma:White to pale cream to pale yellow to pale brown, Crystals or powder or crystalline powder or fused solid
    Peso molecolare:149.15

    Ref: 02-A18056

    25g
    50,00€
    100g
    131,00€
  • Cinnamyl chloride, 95%, stab. with sodium carbonate

    CAS:
    <p>Cinnamyl chloride is used in the enantioselective total synthesis of helioporins C and E, bioactive marine diterpenes. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The o</p>
    Formula:C9H9Cl
    Purezza:95%
    Colore e forma:Clear colorless to yellow to yellow-brown, Liquid
    Peso molecolare:152.62

    Ref: 02-A14408

    1kg
    Prezzo su richiesta
    50g
    46,00€
    250g
    Prezzo su richiesta
  • 2-Bromo-5-iodobenzoic acid, 97%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C7H4BrIO2
    Purezza:97%
    Colore e forma:White, Powder
    Peso molecolare:326.92

    Ref: 02-L19247

    5g
    131,00€
  • Terephthalic acid, 98+%

    CAS:
    <p>Terephthalic acid is used in the metal organic frame works. Terephthalic acid is used primarily to make polyethylene terephthalate (PET) resins and fibers, polyester fibers, films, polyethylene terephthalate solid-state resins and polyethylene terephthalate engineering resins. This Thermo Scientific</p>
    Formula:C8H6O4
    Purezza:98+%
    Colore e forma:White, Powder
    Peso molecolare:166.13

    Ref: 02-A12527

    10kg
    Prezzo su richiesta
    250g
    26,00€
    500g
    43,00€
  • 4-Nitrobenzaldehyde

    CAS:
    Formula:C7H5NO3
    Purezza:96%
    Colore e forma:Solid
    Peso molecolare:151.121

    Ref: 10-F003405

    5g
    9,00€
    1kg
    129,00€
    25g
    13,00€
    100g
    21,00€
    500g
    72,00€
  • 4-Methylanisole, 99%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C8H10O
    Purezza:99%
    Colore e forma:Clear colorless to pale yellow, Liquid
    Peso molecolare:122.17

    Ref: 02-A11572

    100ml
    33,00€
    500ml
    82,00€
    2500ml
    Prezzo su richiesta
  • 2-Hydroxyphenoxyacetic acid, 98+%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C8H8O4
    Purezza:98+%
    Colore e forma:White to pale pink or cream to pale brown, Crystals or powder or crystalline powder
    Peso molecolare:168.15

    Ref: 02-L03897

    5g
    66,00€
    25g
    Prezzo su richiesta
  • Ref: 10-F862438

    1g
    25,00€
    5g
    84,00€
    100mg
    18,00€
  • 3-Chloro-4-(trifluoromethoxy)benzonitrile

    CAS:
    Formula:C8H3ClF3NO
    Purezza:98%
    Peso molecolare:221.56

    Ref: 10-F319198

    5g
    21,00€
  • 1,2-Dichloro-3-nitrobenzene

    CAS:
    Formula:C6H3Cl2NO2
    Purezza:95.0%
    Colore e forma:Solid
    Peso molecolare:192

    Ref: 10-F210145

    25g
    45,00€
  • 4-(Trifluoromethoxy)phenylacetic acid, 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C9H6F3O3
    Purezza:98%
    Colore e forma:White to pale cream, Crystals or powder or crystalline powder
    Peso molecolare:219.14

    Ref: 02-A19512

    1g
    61,00€
    5g
    Prezzo su richiesta
  • 2-Acetamido-6-nitrobenzoic acid

    CAS:
    Formula:C9H8N2O5
    Purezza:97%
    Peso molecolare:224.172

    Ref: 10-F323918

    1g
    28,00€
    5g
    74,00€
  • 2-Phenylpropionaldehyde, 97%

    CAS:
    <p>2-phenylpropionaldehyde to give acetophenone using 1 atm molecular oxygen as oxidant was catalyzed by Ce(IV), V(IV) and Bronsted acids. It is used to produce 3-hydroxy-2-methyl-2-phenyl-propionaldehyde. This reaction will need reagent water and K2CO3. This Thermo Scientific Chemicals brand product w</p>
    Formula:C9H10O
    Purezza:97%
    Colore e forma:Liquid, Clear colorless to pale yellow
    Peso molecolare:134.18

    Ref: 02-B22436

    100g
    57,00€
    500g
    178,00€
  • 1-Ethynyl-4-nitrobenzene

    CAS:
    Formula:C8H5NO2
    Purezza:95%
    Colore e forma:Solid, Orange powder
    Peso molecolare:147.133

    Ref: 10-F224441

    1g
    12,00€
    5g
    28,00€
    10g
    46,00€
    25g
    98,00€
    100g
    329,00€
  • Carbadox, 98+%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C11H10N4O4
    Purezza:98+%
    Peso molecolare:262.22

    Ref: 02-J60284

    25g
    Prezzo su richiesta
    100g
    Prezzo su richiesta
  • 3-Fluoro-2-nitroaniline

    CAS:
    Formula:C6H5FN2O2
    Purezza:95%
    Colore e forma:Solid
    Peso molecolare:156.116

    Ref: 10-F077967

    1g
    17,00€
    5g
    23,00€
    10g
    30,00€
    25g
    61,00€
    100g
    199,00€
  • 4-Fluoro-3-nitroaniline

    CAS:
    Formula:C6H5FN2O2
    Purezza:97%
    Colore e forma:Solid, Crystalline
    Peso molecolare:156.116

    Ref: 10-F001697

    25g
    14,00€
    100g
    28,00€
    500g
    114,00€
  • Methyl 3-(hydroxymethyl)-2-nitrobenzoate

    CAS:
    Purezza:98%
    Peso molecolare:211.1730042

    Ref: 10-F695588

    1g
    307,00€
    100mg
    40,00€
    250mg
    91,00€
  • 4-Bromostyrene, 98%, stab. with 0.1% 4-tert-butylcatechol

    CAS:
    <p>4-Bromostyrene is widely utilized in the synthesis of nitroolefins by alkene cross-metathesis. It plays an important role in the Heck reaction to the synthesis of poly(1,4-phenylenevinylene). It is employed in the structure activity relationships (SAR) study of the chemical and biochemical propertie</p>
    Formula:C8H7Br
    Purezza:0.1%
    Colore e forma:Clear colorless to yellow, Liquid
    Peso molecolare:183.05

    Ref: 02-A17896

    5g
    62,00€
    25g
    227,00€
    100g
    Prezzo su richiesta
  • 4-Chlorobenzaldehyde, 98%

    CAS:
    <p>4-Chlorobenzaldehyde is used as an intermediate for the manufacture of dyestuffs, optical brighteners, pharmaceuticals, agricultural chemicals and metal finishing products. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and </p>
    Formula:C7H5ClO
    Purezza:98%
    Colore e forma:White to pale cream or pale yellow, Crystals or powder or crystalline powder or fused solid or chunks
    Peso molecolare:140.57

    Ref: 02-A12757

    1kg
    109,00€
    5kg
    Prezzo su richiesta
    250g
    43,00€
  • 1-BROMO-2,4-DIFLUORO-3-METHYL-5-NITROBENZENE

    CAS:
    Formula:C7H4BrF2NO2
    Purezza:97%
    Peso molecolare:252.015

    Ref: 10-F389988

    1g
    239,00€
    100mg
    45,00€
    250mg
    69,00€
  • 5-BROMO-2-CHLORO-1,3-DINITROBENZENE

    CAS:
    Formula:C6H2BrClN2O4
    Purezza:98%
    Colore e forma:Solid
    Peso molecolare:281.45

    Ref: 10-F387304

    250mg
    109,00€
  • 2-Fluoro-5-(trifluoromethyl)phenyl isocyanate, 97%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C8H3F4NO
    Purezza:97%
    Colore e forma:Clear colorless, Liquid
    Peso molecolare:205.11

    Ref: 02-B25630

    1g
    Prezzo su richiesta
    5g
    Prezzo su richiesta
  • 2-Chloro-β-nitrostyrene, 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C8H6ClNO2
    Purezza:98%
    Colore e forma:White to yellow, Crystals or powder or crystalline powder
    Peso molecolare:183.59

    Ref: 02-A14882

    5g
    Prezzo su richiesta
    25g
    Prezzo su richiesta
  • N,N-Dimethylglycine hydrochloride, 99%

    CAS:
    <p>N,N-Dimethylglycine (DMG) is a natural N-methylated glycine that is used in comparative analysis with other N-methylated glycines such as sarcosine and ine. Used in the development of glycine-based ionic liquids and emulsifiers. Also it is potentially useful as a biomarker of protein degradation in </p>
    Formula:C4H10ClNO2
    Purezza:99%
    Colore e forma:White to pale cream, Crystals or powder or crystalline powder or lumpy solid
    Peso molecolare:139.58

    Ref: 02-A18892

    5g
    35,00€
    25g
    Prezzo su richiesta
    100g
    Prezzo su richiesta
  • Sodium octanoate, 96%

    CAS:
    <p>Sodium octanoate may be used as a protein stabilizer for molecules such as albumin and fibrinogen under conditions such heat sterilization. Also used for blood plasma fractionation. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documenta</p>
    Formula:C8H15NaO2
    Purezza:96%
    Colore e forma:White to pale cream, Powder or crystals or crystalline powder
    Peso molecolare:166.20

    Ref: 02-A13451

    100g
    58,00€
    500g
    170,00€
  • 1-(2-Mesitylenesulfonyl)-3-nitro-1H-1,2,4-triazole, 99+%

    CAS:
    <p>1-(2-Mesitylenesulfonyl)-3-Nitro-1H-1,2,4-Triazole is an efficient coupling reagent in the synthesis of oligonucleotides via phosphotriester approach. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may </p>
    Formula:C11H12N4O4S
    Purezza:99+%
    Peso molecolare:296.30

    Ref: 02-H54792

    1g
    110,00€
    5g
    Prezzo su richiesta
  • N-Methoxy-N-methylbenzamide, 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C9H11NO2
    Purezza:98%
    Peso molecolare:165.19

    Ref: 02-H54253

    5g
    Prezzo su richiesta
    25g
    Prezzo su richiesta
  • 2,6-Difluoro-4-formylbenzonitrile

    CAS:
    Formula:C8H3F2NO
    Purezza:95%
    Colore e forma:Solid
    Peso molecolare:167.115

    Ref: 10-F077918

    1g
    38,00€
    5g
    117,00€
    10g
    190,00€
    25g
    338,00€
  • o-Toluidine, 99%

    CAS:
    <p>o-Toluidine is used in the production of dyes, as a presumptive test for blood in forensic science. And it is also used in determination of glucose in biological materials, as a precursor in the synthesis of poly(o-toluidine) and copper nanoparticle composite material. This Thermo Scientific Chemica</p>
    Formula:C7H9N
    Purezza:99%
    Colore e forma:Clear colorless or yellow to orange or pink to pale brown, Liquid
    Peso molecolare:107.16

    Ref: 02-A13602

    5kg
    214,00€
  • (S)-(+)-1-Benzyl-3-aminopyrrolidine, 99%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C11H16N2
    Purezza:99%
    Colore e forma:Liquid, Clear colorless to yellow
    Peso molecolare:176.26

    Ref: 02-L09449

    1g
    Prezzo su richiesta
    5g
    Prezzo su richiesta
  • 2,6-Difluoro-3-nitrobenzaldehyde

    CAS:
    Formula:C7H3F2NO3
    Purezza:97%
    Colore e forma:Solid
    Peso molecolare:187.102

    Ref: 10-F044779

    1g
    17,00€
    5g
    75,00€
  • N,N'-p-Phenylenebisacetamide, 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C10H12N2O2
    Purezza:98%
    Colore e forma:Cream to brown or grey, Powder
    Peso molecolare:192.22

    Ref: 02-L08381

    5g
    57,00€
    25g
    Prezzo su richiesta
  • Ref: 10-F696257

    1g
    32,00€
  • 2,5-Dimethylterephthalonitrile

    CAS:
    Formula:C10H8N2
    Purezza:95%
    Colore e forma:Solid, No data available.
    Peso molecolare:156.188

    Ref: 10-F053838

    1g
    45,00€
    5g
    177,00€
    10g
    325,00€
    25g
    696,00€
  • 4′-Nitroacetophenone

    CAS:
    Formula:C8H7NO3
    Purezza:98%
    Colore e forma:Solid, Yellow powder
    Peso molecolare:165.148

    Ref: 10-F225460

    1kg
    75,00€
    25g
    9,00€
    100g
    14,00€
    500g
    39,00€
  • Pentafluorobenzonitrile, 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C7F5N
    Purezza:98%
    Colore e forma:Liquid, Clear colorless to pale yellow
    Peso molecolare:193.08

    Ref: 02-A13575

    5g
    34,00€
    25g
    92,00€
    100g
    Prezzo su richiesta
  • Ref: 10-F621890

    1g
    56,00€
    5g
    177,00€
  • 2-Methoxyphenylacetic acid, 99%

    CAS:
    <p>2-Methoxyphenylacetic acid is used as pharmaceutical intermediate. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU refere</p>
    Formula:C9H10O3
    Purezza:99%
    Colore e forma:White to cream, Crystals or powder or crystalline powder
    Peso molecolare:166.18

    Ref: 02-A15211

    10g
    31,00€
    25g
    61,00€
    50g
    103,00€
  • Chlorobis(4-methoxyphenyl)phosphine, 98+%

    CAS:
    <p>Chlorobis(4-methoxyphenyl)phosphine is used an pharmaceutical intermediate. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or S</p>
    Formula:C14H14ClO2P
    Purezza:98+%
    Colore e forma:White to plae cream or pale grey, Crystals or powder or crystalline powder
    Peso molecolare:280.69

    Ref: 02-H25887

    1g
    Prezzo su richiesta
  • 5-Amino-2-methylbenzenesulfonamide, 96%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C7H10N2O2S
    Purezza:96%
    Colore e forma:Powder, Pale cream
    Peso molecolare:186.23

    Ref: 02-H34056

    1g
    40,00€
    5g
    Prezzo su richiesta
  • 3-Phenoxybenzonitrile

    CAS:
    Formula:C13H9NO
    Purezza:95%
    Peso molecolare:195.221

    Ref: 10-F033913

    1g
    54,00€
  • 2-Iodophenylacetonitrile, 96%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C8H6IN
    Purezza:96%
    Colore e forma:Clear colorless to yellow, Liquid
    Peso molecolare:243.05

    Ref: 02-L12767

    1g
    35,00€
    5g
    92,00€
  • 2,4,6-Trimethoxybenzonitrile, 98%

    CAS:
    <p>2,4,6-Trimethoxybenzonitrile is used as pharmaceutical intermediates. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU ref</p>
    Formula:C10H11NO3
    Purezza:98%
    Colore e forma:Crystals or powder or crystalline powder, White to pale brown or pale orange
    Peso molecolare:193.20

    Ref: 02-B23540

    5g
    45,00€
    25g
    Prezzo su richiesta
  • 3,4-Dimethoxynitrobenzene

    CAS:
    Formula:C8H9NO4
    Purezza:98%
    Colore e forma:Solid, Crystalline
    Peso molecolare:183.163

    Ref: 10-F209901

    5g
    14,00€
    25g
    21,00€
    100g
    46,00€
    500g
    126,00€
  • 2-(tert-Butyl)-6-nitrophenol

    CAS:
    Formula:C10H13NO3
    Purezza:98%
    Peso molecolare:195.218

    Ref: 10-F546455

    1g
    203,00€
    100mg
    49,00€
    250mg
    78,00€
  • (S)-(-)-1-(4-Methoxyphenyl)ethylamine, ChiPros 99+%, ee 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C9H13NO
    Purezza:98%
    Colore e forma:liquid, Clear, colourless
    Peso molecolare:151.21

    Ref: 02-L16322

    1g
    Prezzo su richiesta
    5g
    83,00€
    25g
    Prezzo su richiesta
  • 3,4,5-Trimethoxytoluene, 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C10H14O3
    Purezza:98%
    Colore e forma:Colorless to white, Crystals or powder or crystalline powder or lumps
    Peso molecolare:182.22

    Ref: 02-A15201

    5g
    20,00€
    25g
    Prezzo su richiesta
    50g
    Prezzo su richiesta
  • 4-Ethylanisole, 98+%

    CAS:
    <p>It can be used the synthesis of 1-Methoxy-4-ethyl-1,4-cyclohexadiene. It is also applied in the ligand-assisted, copper-catalyzed enantioselective benzylic amination. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label </p>
    Formula:C9H12O
    Purezza:98+%
    Colore e forma:Clear colorless to pale yellow, Liquid
    Peso molecolare:136.19

    Ref: 02-A10391

    10g
    50,00€
    50g
    172,00€
  • 2-Bromoanisole, 98%

    CAS:
    <p>2-Bromoanisole was used in the synthesis of unsymmetrical substituted biphenyl compounds, used to produce (2-methoxy-phenyl)-acetone at the temperature of 100C. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label infor</p>
    Formula:C7H7BrO
    Purezza:98%
    Colore e forma:Liquid, Clear colorless
    Peso molecolare:187.04

    Ref: 02-A11692

    25g
    39,00€
    100g
    110,00€
  • 2,5-Dichloroanisole, 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C7H6Cl2O
    Purezza:98%
    Colore e forma:Liquid, Clear colorless
    Peso molecolare:177.03

    Ref: 02-L13497

    5g
    41,00€
    25g
    139,00€
  • 4-Methoxybiphenyl, 98+%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C13H12O
    Purezza:98+%
    Colore e forma:White to pale cream or pink, Crystals or powder or crystalline powder or lumps
    Peso molecolare:184.24

    Ref: 02-L01260

    5g
    33,00€
    25g
    Prezzo su richiesta
  • 4-Chloro-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzonitrile

    CAS:
    Purezza:98%
    Colore e forma:Solid
    Peso molecolare:263.5299988

    Ref: 10-F758001

    1g
    208,00€
    5g
    643,00€
    2.5g
    479,00€
    100mg
    57,00€
    250mg
    91,00€
  • 3,4-Dibromobenzaldehyde, 99%

    CAS:
    <p>3,4-Dibromobenzaldehyde is used in the preparation of isomeric branched pi-conjugated system with terminal alkyne by reacting with 4-(triisopropylsilylethynyl) phenylacetylene. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentatio</p>
    Formula:C7H4Br2O
    Purezza:99%
    Colore e forma:White to cream or pale yellow, Crystals or powder or crystalline powder or lumps
    Peso molecolare:263.92

    Ref: 02-L13762

    1g
    93,00€
    5g
    Prezzo su richiesta
  • 3-Methylanisole, 99%

    CAS:
    <p>3-Methylanisole, is widely used in chemical reaction as intermediates to obtain target materials such as dyes, pharmaceuticals, perfumes, photo initiators and agrochemicals. It is also used as a solvent and in perfumery. This Thermo Scientific Chemicals brand product was originally part of the Alfa </p>
    Formula:C8H10O
    Purezza:99%
    Colore e forma:Clear colorless to pale yellow, Liquid
    Peso molecolare:122.17

    Ref: 02-B21455

    50g
    44,00€
    250g
    134,00€
  • 3-Methoxybenzonitrile, 98%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C8H7NO
    Purezza:98%
    Colore e forma:Clear colorless to pale yellow, Liquid
    Peso molecolare:133.15

    Ref: 02-B24171

    5g
    Prezzo su richiesta
    25g
    Prezzo su richiesta
    100g
    Prezzo su richiesta
  • Leflunomide

    CAS:
    <p>An immunosuppressive agent. Inhibits T and B cell proliferation. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU referenc</p>
    Formula:C12H9F3N2O2
    Peso molecolare:270.21

    Ref: 02-J65917

    100mg
    Prezzo su richiesta
    500mg
    Prezzo su richiesta
  • 4-Fluoro-2-methoxybenzonitrile, 97%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C8H6FNO
    Purezza:97%
    Colore e forma:White, Powder
    Peso molecolare:151.14

    Ref: 02-H26627

    1g
    Prezzo su richiesta
    10g
    Prezzo su richiesta
  • 2,6-Difluorobenzonitrile

    CAS:
    Formula:C7H3F2N
    Purezza:95%
    Colore e forma:Solid, Low Melting Solid
    Peso molecolare:139.105

    Ref: 10-F001958

    1kg
    95,00€
    25g
    14,00€
    100g
    21,00€
    500g
    64,00€
  • Homovanillic acid, 98%

    CAS:
    <p>Fluorimetric reagent and major catecholamine metaboliteHomovanillic acid is used as a reagent in the determination of oxidative enzymes. It is associated with dopamine levels in the brain. Its presence supports a diagnosis of neuroblastoma and malignant pheochromocytoma. This Thermo Scientific Chem</p>
    Formula:C9H10O4
    Purezza:98%
    Colore e forma:Crystals or powder or crystalline powder, White to cream to pale brown to pale red
    Peso molecolare:182.18

    Ref: 02-A12441

    1g
    63,00€
    25g
    Prezzo su richiesta
  • 3-(Aminomethyl)benzonitrile

    CAS:
    Formula:C8H8N2
    Purezza:95%
    Colore e forma:Liquid
    Peso molecolare:132.166

    Ref: 10-F078120

    1g
    38,00€
    5g
    110,00€
    10g
    211,00€
    25g
    390,00€
  • Pentafluorophenylhydrazine, 97%

    CAS:
    <p>Pentafluorophenylhydrazine used to determine the purity of N-tert-butyl-N-[1-diethylphosphono-(2,2-dimethylpropyl)]nitroxide (DEPN) using 1H NMR spectroscopy. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label informa</p>
    Formula:C6H3F5N2
    Purezza:97%
    Colore e forma:Pale cream to cream to brown, Crystals or powder or crystalline powder or flakes
    Peso molecolare:198.10

    Ref: 02-A13302

    25g
    Prezzo su richiesta
    100g
    Prezzo su richiesta
  • 3-Bromo-4-methoxybenzonitrile, 99%

    CAS:
    <p>3-Bromo-4-methoxybenzonitrile is used to prepare 3-bromo-2-iodo-4-methoxy-benzonitrile. It is also used as pharmaceutical intermediates. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the l</p>
    Formula:C8H6BrNO
    Purezza:99%
    Colore e forma:White to cream to yellow, Crystals or powder or crystalline powder
    Peso molecolare:212.05

    Ref: 02-A16698

    5g
    Prezzo su richiesta
    25g
    125,00€
  • 2,4,6-Trimethoxytoluene, 97%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C10H14O3
    Purezza:97%
    Colore e forma:Colorless to white to yellow, Low melting crystals or powder or crystalline powder or clear liquid
    Peso molecolare:182.22

    Ref: 02-L02155

    5g
    94,00€
    25g
    337,00€
  • 3-Methoxy-4-nitrobenzoic acid, 98+%

    CAS:
    <p>3-Methoxy-4-nitrobenzoic acid was used in detection of nitroaromatic compounds by CdSe- quantum dots capped with polyamidoamine dendrimer-1,12-diaminododecane core-generation 4 nanocomposites. It was used in the synthesis of vorozole derivatives. This Thermo Scientific Chemicals brand product was or</p>
    Formula:C8H7NO5
    Purezza:98+%
    Colore e forma:White to cream to pale brown or pale yellow, Crystals or powder or crystalline powder
    Peso molecolare:197.15

    Ref: 02-L08891

    5g
    Prezzo su richiesta
    25g
    114,00€
  • 3-Methoxyphenylacetic acid, 97%

    CAS:
    <p>A fluorimetric method for the estimation of 4-hydroxy-3-methoxyphenylacetic acid (homovanillic acid) has been developed and applied to normal brain tissue. The presence of homovanillic acid in the caudate nucleus of normal animals of several species has been demonstrated. This Thermo Scientific Chem</p>
    Formula:C9H9O3
    Purezza:97%
    Colore e forma:White to cream to pale brown, Crystals or powder or crystalline powder and/or chunks
    Peso molecolare:165.17

    Ref: 02-A10951

    5g
    30,00€
    25g
    90,00€
    100g
    234,00€
  • 4-Formyl-2-methoxybenzonitrile

    CAS:
    Purezza:98%
    Colore e forma:Solid
    Peso molecolare:161.1600037

    Ref: 10-F608845

    1g
    74,00€
    5g
    156,00€
    10g
    283,00€
  • 3,5-Difluoroanisole, 97%

    CAS:
    <p>This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Sci</p>
    Formula:C7H6F2O
    Purezza:97%
    Colore e forma:Clear colorless, Liquid
    Peso molecolare:144.12

    Ref: 02-A15497

    25g
    Prezzo su richiesta
  • 3-(Trifluoromethyl)phenylhydrazine, 95%

    CAS:
    <p>3-(Trifluoromethyl)phenylhydrazine is used in the synthesis of N-2-diphenylhydrazinecarboxamides and N-2-diphenylhydrazine carbothioamides. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to th</p>
    Formula:C7H7F3N2
    Purezza:95%
    Colore e forma:Liquid, Clear, colorless to yellow
    Peso molecolare:176.14

    Ref: 02-L11996

    1g
    Prezzo su richiesta
    5g
    Prezzo su richiesta
  • 3,5-Bis(trifluoromethyl)phenylacetonitrile, 97%

    CAS:
    <p>3,5-Bis(trifluoromethyl)phenylacetonitrile may be used in chemical synthesis. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or</p>
    Formula:C10H5F6N
    Purezza:97%
    Colore e forma:Liquid, Clear colorless to pale yellow
    Peso molecolare:253.15

    Ref: 02-A19576

    1g
    Prezzo su richiesta
    5g
    Prezzo su richiesta