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Active pharmaceutical ingredient (API) impurities for research

All products contained in this category are intended for laboratory use only, and are not meant for human consumption.

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BrandProduct dataPurityPrice rangeEstimated delivery
Mebendazole Related Compound D (Methyl 5-benzoyl-1-methylbenzimidazol-2-ylcarbamate)
REF: 45-1375524CAS: 132119-11-0 		- - -1,493.00 €Fri 27 Dec 24
Ibuprofen Related Compound J (2-(4-Isobutyrylphenyl)propanoic acid)
REF: 45-1335596CAS: 65813-55-0 		- - -1,477.00 €Fri 27 Dec 24
Bupropion Hydrochloride Related Compound A (2-(tert-butylamino)-4'-chloropropiophenone hydrochloride)
REF: 45-1078744CAS: 1049718-72-0 		- - -1,495.00 €Fri 27 Dec 24
Azithromycin Related Compound H (3'-N-{[4-(Acetylamino)phenyl]sulfonyl}-3'-N-demethylazithromycin)
REF: 45-1046023CAS: 612069-30-4 		- - -1,477.00 €Fri 27 Dec 24
Cyclopentylpropanoic Acid (3-Cyclopentylpropanoic acid)
REF: 45-1156167CAS: 140-77-2 		- - -187.00 €Fri 27 Dec 24
Pravastatin Related Compound B (sodium (3R,5R)-3,5-dihydroxy-7-((1S,2S,6R,8S,8aR)-6-hydroxy-2-methyl-8-((S)-2-methylbutanoyloxy)-1,2,6,7,8,8a-hexahydronaphthalen-1-yl)heptanoate)
REF: 45-1554228CAS: 81176-41-2 		- - -1,441.00 €Fri 27 Dec 24
R-Ofloxacin ((R)-9-fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylic acid)
REF: 45-1478083CAS: 100986-86-5 		- - -1,371.00 €Fri 27 Dec 24
Estazolam Related Compound A (5-Chloro-2-(3-chloromethyl-4H-1,2,4-triazol-4-yl)-benzophenone)
REF: 45-1249916CAS: 37945-06-5 		- - -1,292.00 €Fri 27 Dec 24
Paclitaxel Related Compound A (Cephalomannine)
REF: 45-1491343CAS: 71610-00-9 		- - -2,084.00 €Fri 27 Dec 24
Amoxicillin Related Compound B (L-amoxicillin)
REF: 45-1031525CAS: 26889-93-0 		- - -1,477.00 €Fri 27 Dec 24
Medroxyprogesterone Acetate Related Compound B (17-Hydroxy-6α-methylpregn-4-ene-3,20-dione)
REF: 45-1378023CAS: 520-85-4 		- - -1,477.00 €Fri 27 Dec 24
Doxazosin Related Compound B (6,7-dimethoxyquinazoline-2,4-dione)
REF: 45-1225441CAS: 28888-44-0 		- - -1,477.00 €Fri 27 Dec 24
Felodipine Related Compound A (3-Ethyl 5-methyl 4-(2,3-dichlorophenyl)-2,6-dimethylpyridine-3,5-dicarboxylate)
REF: 45-1269390CAS: 96382-71-7 		- - -1,371.00 €Fri 27 Dec 24
Artemether Related Compound B ((3R,5aS,6R,8aS,9R,10R,12R,12aR)-Decahydro-10-methoxy-3,6,9-trimethyl-3,12-epoxy-12H-pyrano[4,3-j]-1,2-benzodioxepin)
REF: 45-1042805CAS: 71939-51-0 		- - -1,371.00 €Fri 27 Dec 24
Metaraminol Related Compound A ((E)-1-[3-(benzyloxy)phenyl]-2-(hydroxyimino)propan-1-one)
REF: 45-1396036		- - -1,328.00 €Fri 27 Dec 24
Moxifloxacin Related Compound E (1-Cyclopropyl-6-fluoro-8-hydroxy-1,4-dihydro-7-[(4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic acid hydrochloride)
REF: 45-1448655		- - -1,441.00 €Fri 27 Dec 24
Tizanidine Related Compound B (N-acetyltizanidine)
REF: 45-1667924CAS: 173532-15-5 		- - -1,371.00 €Fri 27 Dec 24
Clonazepam Related Compound B (2-Amino-2'-chloro-5-nitrobenzophenone)
REF: 45-1140338CAS: 2011-66-7 		- - -1,371.00 €Fri 27 Dec 24
Losartan Related Compound A (2-Butyl-4-chloro-1H-imidazole-5-carbaldehyde)
REF: 45-1370473CAS: 83857-96-9 		- - -1,371.00 €Fri 27 Dec 24
Buspirone Related Compound N (8,8'-(Butane-1,4-diyl)bis(8-azaspiro[4.5]decane-7,9-dione)
REF: 45-1078835CAS: 257877-44-4 		- - -1,477.00 €Fri 27 Dec 24
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Mebendazole Related Compound D (Methyl 5-benzoyl-1-methylbenzimidazol-2-ylcarbamate)

CAS:132119-11-0
Heterocyclic compounds with nitrogen hetero-atom(s) only, aromatic or modified aromatic, nesoi
Formula:
C17H15N3O3
Color and Shape:
Solid
Molecular weight:
309.11134

Ref: 45-1375524

Estimated delivery in United States, on Friday 27 Dec 2024
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Ibuprofen Related Compound J (2-(4-Isobutyrylphenyl)propanoic acid)

CAS:65813-55-0
Aromatic polycarboxylic acids, their anhydrides, halides, peroxides, peroxyacids etc not elsewhere specified or included
Formula:
C13H16O3
Color and Shape:
Brown Solid
Molecular weight:
220.10994

Ref: 45-1335596

Estimated delivery in United States, on Friday 27 Dec 2024
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Bupropion Hydrochloride Related Compound A (2-(tert-butylamino)-4'-chloropropiophenone hydrochloride)

CAS:1049718-72-0
Amino-aldehydes, amino-ketones and amino-quinones, other than those containing more than one kind of oxygen function; …
Formula:
C13H18ClNO·HCl
Color and Shape:
White Powder
Molecular weight:
275.08437

Ref: 45-1078744

Estimated delivery in United States, on Friday 27 Dec 2024
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Azithromycin Related Compound H (3'-N-{[4-(Acetylamino)phenyl]sulfonyl}-3'-N-demethylazithromycin)

CAS:612069-30-4
Sulfonamides, nesoi
Formula:
C45H77N3O15S
Color and Shape:
White Powder
Molecular weight:
931.50754

Ref: 45-1046023

Estimated delivery in United States, on Friday 27 Dec 2024
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Cyclopentylpropanoic Acid (3-Cyclopentylpropanoic acid)

CAS:140-77-2
Cyclanic, cyclenic or cycloterpenic monocarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and their derivatives
Formula:
C8H14O2
Color and Shape:
Colorless Yellow Liquid
Molecular weight:
142.09938

Ref: 45-1156167

Estimated delivery in United States, on Friday 27 Dec 2024
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Pravastatin Related Compound B (sodium (3R,5R)-3,5-dihydroxy-7-((1S,2S,6R,8S,8aR)-6-hydroxy-2-methyl-8-((S)-2-methylbutanoyloxy)-1,2,6,7,8,8a-hexahydronaphthalen-1-yl)heptanoate)

CAS:81176-41-2
Carboxylic acids w/ alcohol function but w/o other oxyg
Formula:
C23H36O7
Color and Shape:
Powder
Molecular weight:
424.2461

Ref: 45-1554228

Estimated delivery in United States, on Friday 27 Dec 2024
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R-Ofloxacin ((R)-9-fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylic acid)

CAS:100986-86-5
Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds, nesoi
Formula:
C18H20FN3O4
Color and Shape:
Yellow Pale Yellow Powder
Molecular weight:
361.14378

Ref: 45-1478083

Estimated delivery in United States, on Friday 27 Dec 2024
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Estazolam Related Compound A (5-Chloro-2-(3-chloromethyl-4H-1,2,4-triazol-4-yl)-benzophenone)

CAS:37945-06-5
Heterocyclic compounds (excluding aromatic or modified
Formula:
C16H11Cl2N3O
Color and Shape:
Light Yellow Crystalline Powder
Molecular weight:
331.02792

Ref: 45-1249916

Estimated delivery in United States, on Friday 27 Dec 2024
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Paclitaxel Related Compound A (Cephalomannine)

CAS:71610-00-9
Aromatic heterocyclic compounds with oxygen hetero-atom(s) only, nesoi
Formula:
C45H53NO14
Color and Shape:
White Off-White Powder
Molecular weight:
831.34661

Ref: 45-1491343

Estimated delivery in United States, on Friday 27 Dec 2024
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Amoxicillin Related Compound B (L-amoxicillin)
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Amoxicillin Related Compound B (L-amoxicillin)

CAS:26889-93-0
Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds, nesoi
Formula:
C16H19O5N3S
Color and Shape:
Powder
Molecular weight:
365.10454

Ref: 45-1031525

Estimated delivery in United States, on Friday 27 Dec 2024
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Medroxyprogesterone Acetate Related Compound B (17-Hydroxy-6α-methylpregn-4-ene-3,20-dione)

CAS:520-85-4
Estrogens and progestins
Formula:
C22H32O3
Color and Shape:
White Powder
Molecular weight:
344.23514

Ref: 45-1378023

Estimated delivery in United States, on Friday 27 Dec 2024
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Doxazosin Related Compound B (6,7-dimethoxyquinazoline-2,4-dione)

CAS:28888-44-0
Aromatic or modified aromatic drugs with nitrogen hetero-atom(s) only, not elsewhere specified or included
Formula:
C10H10N2O4
Color and Shape:
White Powder
Molecular weight:
222.06406

Ref: 45-1225441

Estimated delivery in United States, on Friday 27 Dec 2024
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Felodipine Related Compound A (3-Ethyl 5-methyl 4-(2,3-dichlorophenyl)-2,6-dimethylpyridine-3,5-dicarboxylate)

CAS:96382-71-7
Compounds containing an unfused pyridine ring in the structure, nesoi
Formula:
C18H17Cl2NO4
Color and Shape:
White Powder
Molecular weight:
381.05346

Ref: 45-1269390

Estimated delivery in United States, on Friday 27 Dec 2024
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Artemether Related Compound B ((3R,5aS,6R,8aS,9R,10R,12R,12aR)-Decahydro-10-methoxy-3,6,9-trimethyl-3,12-epoxy-12H-pyrano[4,3-j]-1,2-benzodioxepin)

CAS:71939-51-0
Heterocyclic compounds with oxygen hetero-atom(s) only
Formula:
C16H26O5
Color and Shape:
White Solid Powder
Molecular weight:
298.17802

Ref: 45-1042805

Estimated delivery in United States, on Friday 27 Dec 2024
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Metaraminol Related Compound A ((E)-1-[3-(benzyloxy)phenyl]-2-(hydroxyimino)propan-1-one)

Aromatic imines and their derivatives, salts thereof
Formula:
C16H16NO3
Color and Shape:
Off-White Solid
Molecular weight:
270.11302

Ref: 45-1396036

Estimated delivery in United States, on Friday 27 Dec 2024
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Moxifloxacin Related Compound E (1-Cyclopropyl-6-fluoro-8-hydroxy-1,4-dihydro-7-[(4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic acid hydrochloride)

Compounds (excluding drugs and pesticides) containing a quinoline or isoquinoline ring
Formula:
C20H22FN3O4·HCl
Color and Shape:
Powder
Molecular weight:
387.15943

Ref: 45-1448655

Estimated delivery in United States, on Friday 27 Dec 2024
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Tizanidine Related Compound B (N-acetyltizanidine)

CAS:173532-15-5
Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds, nesoi
Formula:
C11H10ClN5OS
Color and Shape:
Yellow Powder
Molecular weight:
295.02946

Ref: 45-1667924

Estimated delivery in United States, on Friday 27 Dec 2024
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Clonazepam Related Compound B (2-Amino-2'-chloro-5-nitrobenzophenone)

CAS:2011-66-7
Amino-aldehydes, amino-ketones and amino-quinones, other than those containing more than one kind of oxygen function; …
Formula:
C13H9ClN2O3
Color and Shape:
Yellow Powder
Molecular weight:
276.03017

Ref: 45-1140338

Estimated delivery in United States, on Friday 27 Dec 2024
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Losartan Related Compound A (2-Butyl-4-chloro-1H-imidazole-5-carbaldehyde)

CAS:83857-96-9
Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure nesoi
Formula:
C8H11ClN2O
Color and Shape:
Powder
Molecular weight:
186.05599

Ref: 45-1370473

Estimated delivery in United States, on Friday 27 Dec 2024
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Buspirone Related Compound N (8,8'-(Butane-1,4-diyl)bis(8-azaspiro[4.5]decane-7,9-dione)
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Buspirone Related Compound N (8,8'-(Butane-1,4-diyl)bis(8-azaspiro[4.5]decane-7,9-dione)

CAS:257877-44-4
Compounds containing an unfused pyridine ring in the structure, nesoi
Formula:
C22H32N2O4
Color and Shape:
White Solid
Molecular weight:
388.23621

Ref: 45-1078835

Estimated delivery in United States, on Friday 27 Dec 2024
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