Building Blocks

Esta sección contiene productos fundamentales para la síntesis de compuestos orgánicos y biológicos. Los bloques de construcción son los materiales de partida esenciales utilizados para construir moléculas complejas a través de diversas reacciones químicas. Desempeñan un papel crítico en el descubrimiento de fármacos, la ciencia de materiales y la investigación química. En CymitQuimica, ofrecemos una gama diversa de bloques de construcción de alta calidad para apoyar sus investigaciones innovadoras y proyectos industriales, asegurando que tenga los componentes esenciales para una síntesis exitosa.

Subcategorías de "Building Blocks"

Ácidos borónicos y derivados del ácido borónico

Building Blocks quirales

Building Blocks de hidrocarburos

Building Blocks orgánicos

Productos de "Building Blocks"

100
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productos por página. Hay 262851 productos en esta categoría.

Datos del producto	Pureza	Rango de precios	Entrega estimada
tert-Butyl 3-(1-amino-2-methoxy-2-oxoethyl)piperidine-1-carboxylate REF: 3D-UYB38030CAS: 1219380-30-9	Min. 95%	A consultar	Mar 07 Ene 25
Ethyl 4-methylpyrrolidine-2-carboxylate hydrochloride REF: 3D-UYB38353CAS: 1219383-53-5	Min. 95%	A consultar	Mar 07 Ene 25
ethyl 4-benzylmorpholine-3-carboxylate REF: 3D-UYB38386CAS: 1219383-86-4	Min. 95%	A consultar	Mar 07 Ene 25
Fmoc-3-fluoro-DL-tyrosine REF: 3D-UYB38996CAS: 1219389-96-4	Min. 95%	A consultar	Mar 07 Ene 25
3-(Dimethylamino)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid REF: 3D-UYB39160CAS: 1219391-60-2	Min. 95%	A consultar	Mar 07 Ene 25
N-(N-Butyl)deoxygalactonojirimycin REF: 3D-UYB39358CAS: 1219393-58-4	Min. 95%	A consultar	Mar 07 Ene 25
2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-(5-chloro-1H-indol-3-yl)propanoicacid REF: 3D-UYB39851CAS: 1219398-51-2	Min. 95%	A consultar	Mar 07 Ene 25
6-Amino-5,6-dihydroimidazo[1,2-a]pyrimidin-7(8H)-one REF: 3D-UYB40660CAS: 1219406-60-6	Min. 95%	A consultar	Mar 07 Ene 25
Methyl amino(2-bromophenyl)acetate hydrochloride REF: 3D-UYB40844CAS: 1219408-44-2	Min. 95%	A consultar	Mar 07 Ene 25
Boc-beta-cyclopenten-1-yl-DL-alanine REF: 3D-UYB41102CAS: 1219411-02-5	Min. 95%	A consultar	Mar 07 Ene 25
2-{[(9H-Fluoren-9-yl)methoxy]carbonyl}-6-methoxy-1H,2H,3H,4H,9H-pyrido[3,4-b]indole-1-carboxylic acid REF: 3D-UYB41681CAS: 1219416-81-5	Min. 95%	A consultar	Mar 07 Ene 25
3-cyclopentyl-2-({[(9h-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid REF: 3D-UYB42204CAS: 1219422-04-4	Min. 95%	A consultar	Mar 07 Ene 25
4-Benzylpiperazine-2-carboxylic acid hydrochloride REF: 3D-UYB42376CAS: 1219423-76-3	Min. 95%	A consultar	Mar 07 Ene 25
1,3-Dimethylpiperazin-2-one hydrochloride REF: 3D-UYB42522CAS: 1219425-22-5	Min. 95%	A consultar	Mar 07 Ene 25
Amino(cyclopropyl)acetic acid HCl REF: 3D-UYB42981CAS: 1219429-81-8	Min. 95%	A consultar	Mar 07 Ene 25
2-(tert-Butoxycarbonyl)-2-azabicyclo[3.1.0]hexane-3-carboxylic acid REF: 3D-UYB43061CAS: 1219430-61-1	Min. 95%	A consultar	Mar 07 Ene 25
(2R)-2-{[(tert-Butoxy)carbonyl]amino}propanethioic S-acid REF: 3D-UYB45297CAS: 1219452-97-7	Min. 95%	A consultar	Mar 07 Ene 25
3-Methyl-1-(4-methylphenyl)butan-1-amine hydrochloride REF: 3D-UYB45577CAS: 1219455-77-2	Min. 95%	A consultar	Mar 07 Ene 25
1-(2-Fluorophenyl)-3-methylbutan-1-amine hydrochloride REF: 3D-UYB45578CAS: 1219455-78-3	Min. 95%	A consultar	Mar 07 Ene 25
1-(3-Fluorophenyl)-3-methylbutan-1-amine hydrochloride REF: 3D-UYB45587CAS: 1219455-87-4	Min. 95%	A consultar	Mar 07 Ene 25
2-Cyclopropyl-6-oxo-1,6-dihydropyrimidine-5-carboxylic acid REF: 3D-UYB56135CAS: 1219561-35-9	Min. 95%	A consultar	Mar 07 Ene 25
1-Cyclopropyl-5-oxo-2-phenylpyrrolidine-3-carboxylic acid REF: 3D-UYB57156CAS: 1219571-56-8	Min. 95%	A consultar	Mar 07 Ene 25
3-(4-Fluorophenyl)-1,2,4-oxadiazol-5-amine REF: 3D-UYB58494CAS: 1219584-94-7	Min. 95%	A consultar	Mar 07 Ene 25
(2R,3S)-4-{[(9H-Fluoren-9-yl)methoxy]carbonyl}-2-methylmorpholine-3-carboxylic acid REF: 3D-UYB60331CAS: 1219603-31-2	Min. 95%	A consultar	Mar 07 Ene 25
4-(Prop-2-yn-1-yl)piperazin-2-one REF: 3D-UYB60629CAS: 1219606-29-7	Min. 95%	A consultar	Mar 07 Ene 25
Methyl 4-(4-formylphenyl)benzoate REF: 3D-VCA91689CAS: 70916-89-1	Min. 95%	A consultar	Mar 07 Ene 25
2-(1,2,3,4-Tetrahydroisoquinolin-3-yl)ethan-1-ol REF: 3D-VCA91784CAS: 70917-84-9	Min. 95%	A consultar	Mar 07 Ene 25
1-N-(Propan-2-yl)benzene-1,2-diamine REF: 3D-VCA91895CAS: 70918-95-5	Min. 95%	A consultar	Mar 07 Ene 25
Methyl 2,4,6-trimethylbenzenesulfonate REF: 3D-VCA92059CAS: 70920-59-1	Min. 95%	A consultar	Mar 07 Ene 25
N-[2-(4-Pyridinyl)ethyl]-acetamide REF: 3D-VCA92239CAS: 70922-39-3	Min. 95%	A consultar	Mar 07 Ene 25
[(4-Fluorophenyl)thio]acetyl chloride REF: 3D-VCA93209CAS: 70932-09-1	Min. 95%	A consultar	Mar 07 Ene 25
N-(3-Ethynylphenyl)acetamide REF: 3D-VCA93358CAS: 70933-58-3	Min. 95%	A consultar	Mar 07 Ene 25
2-Amino-6H,7H,8H,9H,11H-pyrido[2,1-b]quinazolin-11-one REF: 3D-VCA93409CAS: 70934-09-7	Min. 95%	A consultar	Mar 07 Ene 25
Methyl 4-(2,5-dimethoxyphenyl)-2,4-dioxobutanoate REF: 3D-VCA93515CAS: 70935-15-8	Min. 95%	A consultar	Mar 07 Ene 25
4-Ethyl-3-nitro-pyridin-2-ylamine REF: 3D-VCA93616CAS: 70936-16-2	Min. 95%	A consultar	Mar 07 Ene 25
1H-1,2,3-Benzotriazole-5-carbaldehyde REF: 3D-VCA93842CAS: 70938-42-0	Min. 95%	A consultar	Mar 07 Ene 25
4-Bromo-1-ethyl-3-nitro-1H-pyrazole REF: 3D-VCA95184CAS: 70951-84-7	Min. 95%	A consultar	Mar 07 Ene 25
4-Bromo-1-t-butylpyrazole REF: 3D-VCA95185CAS: 70951-85-8	Min. 95%	A consultar	Mar 07 Ene 25
1,4-Dimethyl-5-nitro-1H-pyrazole REF: 3D-VCA95189CAS: 70951-89-2	Min. 95%	A consultar	Mar 07 Ene 25
1-Ethyl-3,4-dinitro-1H-pyrazole REF: 3D-VCA95190CAS: 70951-90-5	Min. 95%	A consultar	Mar 07 Ene 25
4-Bromo-3,5-dimethyl-1-nitro-1H-pyrazole REF: 3D-VCA95193CAS: 70951-93-8	Min. 95%	A consultar	Mar 07 Ene 25
5-Acetyl-2-methylbenzene-1-sulfonamide REF: 3D-VCA95870CAS: 70958-70-2	Min. 95%	A consultar	Mar 07 Ene 25
N-Boc-N-ethyl-L-phenylalanine REF: 3D-VCA96124CAS: 70961-24-9	Min. 95%	A consultar	Mar 07 Ene 25
N-Methyl-3-(methylsulfanyl)propanamide REF: 3D-VCA96162CAS: 70961-62-5	Min. 95%	A consultar	Mar 07 Ene 25
N-(2-Cyano-2-methylethyl)benzamide REF: 3D-VCA96488CAS: 70964-88-4	Min. 95%	A consultar	Mar 07 Ene 25
6-Ethyl-2-(methylsulfanyl)-3,4-dihydropyrimidin-4-one REF: 3D-VCA96737CAS: 70967-37-2	Min. 95%	A consultar	Mar 07 Ene 25
methyl 2-amino-2-ethylbutanoate REF: 3D-VCA97426CAS: 70974-26-4	Min. 95%	A consultar	Mar 07 Ene 25
1-(3-Amino-5-bromo-2-hydroxyphenyl)ethan-1-one REF: 3D-VCA97785CAS: 70977-85-4	Min. 95%	A consultar	Mar 07 Ene 25
2-[(4-Methoxyphenyl)methyl]-2H-1,2,3,4-tetrazole-5-carboxylic acid REF: 3D-VCA97820CAS: 70978-20-0	Min. 95%	A consultar	Mar 07 Ene 25
1-(azidomethyl)-4-methoxybenzene REF: 3D-VCA97837CAS: 70978-37-9	Min. 95%	75,00 €~894,00 €	Mar 07 Ene 25
4-(2-Methoxyethoxy)piperidine REF: 3D-VCA97888CAS: 70978-88-0	Min. 95%	A consultar	Mar 07 Ene 25
4-(2-Ethoxyethoxy)piperidine REF: 3D-VCA97893CAS: 70978-93-7	Min. 95%	A consultar	Mar 07 Ene 25
4-[2-(Propan-2-yloxy)ethoxy]piperidine REF: 3D-VCA97901CAS: 70979-01-0	Min. 95%	A consultar	Mar 07 Ene 25
1-[4-(2-Hydroxy-ethoxy)-piperidin-1-yl]-ethanone REF: 3D-VCA97923CAS: 70979-23-6	Min. 95%	A consultar	Mar 07 Ene 25
3-(Furan-2-yl)-2-(phenylformamido)prop-2-enoic acid REF: 3D-VCA98454CAS: 70984-54-2	Min. 95%	A consultar	Mar 07 Ene 25
Benzyl N-[(4,5-dihydro-1H-imidazol-2-yl)methyl]carbamate REF: 3D-VCA98491CAS: 70984-91-7	Min. 95%	A consultar	Mar 07 Ene 25
3,5-Dimethoxybenzoylacetonitrile REF: 3D-VCA98804CAS: 70988-04-4	Min. 95%	A consultar	Mar 07 Ene 25
2-(1-Chloroethyl)-5-(4-chlorophenyl)-1,3-oxazole REF: 3D-VCA99653CAS: 70996-53-1	Min. 95%	A consultar	Mar 07 Ene 25
2-Amino-1-thiophen-2-yl-ethanone hydrochloride REF: 3D-VCA99665CAS: 70996-65-5	Min. 95%	A consultar	Mar 07 Ene 25
2-Chloro-N-[2-oxo-2-(thiophen-2-yl)ethyl]acetamide REF: 3D-VCA99666CAS: 70996-66-6	Min. 95%	A consultar	Mar 07 Ene 25
(S)-beta-(3-Hydroxyphenyl)alanine REF: 3D-VCB14942CAS: 695149-42-9	Min. 95%	A consultar	Mar 07 Ene 25
6-Methyl-2,4-dihydro-1H-3,1-benzoxazin-2-one REF: 3D-VCB15443CAS: 695154-43-9	Min. 95%	A consultar	Mar 07 Ene 25
2-[3-(1H-1,2,4-Triazol-1-yl)propoxy]benzonitrile REF: 3D-VCB15811CAS: 695158-11-3	Min. 95%	A consultar	Mar 07 Ene 25
4-Tertbutyloxycarbonyl-aminophenylacetaldehyde REF: 3D-VCB17191CAS: 695171-91-6	Min. 95%	A consultar	Mar 07 Ene 25
(Cyclohexyl-methanesulfonyl-amino)-acetic acid REF: 3D-VCB17416CAS: 695174-16-4	Min. 95%	A consultar	Mar 07 Ene 25
Ethyl 2-(2-bromo-4-formyl-6-methoxyphenoxy)propanoate REF: 3D-VCB17482CAS: 695174-82-4	Min. 95%	A consultar	Mar 07 Ene 25
3-Chloro-2-fluorocinnamic acid REF: 3D-VCB18715CAS: 695187-15-6	Min. 95%	A consultar	Mar 07 Ene 25
4-Bromo-3-fluorobenzoyl chloride REF: 3D-VCB18821CAS: 695188-21-7	Min. 95%	A consultar	Mar 07 Ene 25
4-{[4-Cyclopropyl-6-(trifluoromethyl)pyrimidin-2-yl]oxy}butanoic acid REF: 3D-VCB19161CAS: 695191-61-8	Min. 95%	A consultar	Mar 07 Ene 25
2-(3,4-Dimethylbenzenesulfonamido)acetic acid REF: 3D-VCB20986CAS: 695209-86-0	Min. 95%	A consultar	Mar 07 Ene 25
5-Fluoro-3-(piperidin-3-yl)-1H-indole REF: 3D-VCB21399CAS: 695213-99-1	Min. 95%	A consultar	Mar 07 Ene 25
tert-Butyl 2,3-Dihydro-1H-inden-5-ylcarbamate REF: 3D-VCB23156CAS: 695231-56-2	Min. 95%	A consultar	Mar 07 Ene 25
2,4-Dipropoxybenzoic acid REF: 3D-VCB81218CAS: 695812-18-1	Min. 95%	A consultar	Mar 07 Ene 25
3-tert-butyl-1-iodoimidazo[1,5-a]pyrazin-8-amine REF: 3D-VCC26701CAS: 1320267-01-3	Min. 95%	A consultar	Mar 07 Ene 25
rac-(3aR,6aR)-Hexahydro-2H-1λ6-thieno[2,3-c]pyrrole-1,1-dione hydrochloride REF: 3D-VCC32661CAS: 1320326-61-1	Min. 95%	A consultar	Mar 07 Ene 25
rel-N-[(3R,3aR,6aS)-Hexahydro-1,1-dioxido-2H-thieno[2,3-c]pyrrol-3-yl]-carbamic acid 1,1-dimethylethyl ester REF: 3D-VCC32672CAS: 1320326-72-4	Min. 95%	A consultar	Mar 07 Ene 25
2-Chloro-6-methylpyridine-4-boronic acid REF: 3D-VCC39715CAS: 1320397-15-6	Min. 95%	A consultar	Mar 07 Ene 25
2-Heptylpyrrolidine REF: 3D-VDA01843CAS: 95018-43-2	Min. 95%	A consultar	Mar 07 Ene 25
4-Allyl-1-mercapto-4H-[1,2,4]triazolo[4,3-a]quinazolin-5-one REF: 3D-VDA02849CAS: 95028-49-2	Min. 95%	A consultar	Mar 07 Ene 25
3-(3-Fluorophenyl)-2-oxopropanoic acid REF: 3D-VDA04189CAS: 95041-89-7	Min. 95%	A consultar	Mar 07 Ene 25
1-Benzyl-3-hydrazinylidene-2,3-dihydro-1H-indol-2-one REF: 3D-VDA06080CAS: 95060-80-3	Min. 95%	A consultar	Mar 07 Ene 25
2-(2-Hydroxy-5-methoxyphenyl)-2-oxoacetic acid REF: 3D-VDA06266CAS: 95062-66-1	Min. 95%	A consultar	Mar 07 Ene 25
1-Bromo-3-(ethoxymethyl)benzene REF: 3D-VDA06801CAS: 95068-01-2	Min. 95%	A consultar	Mar 07 Ene 25
4-Bromo-2-fluoro-1-(methoxymethyl)benzene REF: 3D-VDA06802CAS: 95068-02-3	Min. 95%	A consultar	Mar 07 Ene 25
4-[(Methylsulfanyl)methyl]benzaldehyde REF: 3D-VDA06817CAS: 95068-17-0	Min. 95%	A consultar	Mar 07 Ene 25
3-(4-Methyl-1H-imidazol-1-yl)propan-1-amine dihydrochloride REF: 3D-VDA08220CAS: 95082-20-5	Min. 95%	A consultar	Mar 07 Ene 25
4-amino-N-(2-methoxyethyl)benzamide REF: 3D-VDA08697CAS: 95086-97-8	Min. 95%	A consultar	Mar 07 Ene 25
2,4-Dichloro-6-hydroxybenzene-1-sulfonyl chloride REF: 3D-VDA08777CAS: 95087-77-7	Min. 95%	A consultar	Mar 07 Ene 25
Sodium 2-phenylethane-1-sulfinate REF: 3D-VDA09108CAS: 95091-08-0	Min. 95%	68,00 €~810,00 €	Mar 07 Ene 25
N-Methoxy-N-methylnicotinamide REF: 3D-VDA09191CAS: 95091-91-1	Min. 95%	A consultar	Mar 07 Ene 25
2-(1,2,3,4-Tetrahydronaphthalen-1-yl)pyrrolidine REF: 3D-VDA09206CAS: 95092-06-1	Min. 95%	A consultar	Mar 07 Ene 25
2-(But-3-en-1-yl)pyrrolidine REF: 3D-VDA09207CAS: 95092-07-2	Min. 95%	A consultar	Mar 07 Ene 25
N-Methoxy-N-methyl-2-phenylacetamide REF: 3D-VDA09210CAS: 95092-10-7	Min. 95%	A consultar	Mar 07 Ene 25
ethyl 4-aminonaphthalene-1-carboxylate REF: 3D-VDA09284CAS: 95092-84-5	Min. 95%	A consultar	Mar 07 Ene 25
5-Hydroxy-1-benzothiophene-2-carboxylic acid REF: 3D-VDA09487CAS: 95094-87-4	Min. 95%	A consultar	Mar 07 Ene 25
2-Methyl-5-(trifluoromethyl)-4H,7H-[1,2,4]triazolo[1,5-a]pyrimidin-7-one REF: 3D-VDA09567CAS: 95095-67-3	Min. 95%	A consultar	Mar 07 Ene 25
3-Amino-6-chloropicolinonitrile REF: 3D-VDA09584CAS: 95095-84-4	Min. 95%	A consultar	Mar 07 Ene 25
2-Chloro-3-cyanoquinoline REF: 3D-VDA10421CAS: 95104-21-5	Min. 95%	A consultar	Mar 07 Ene 25
2-Chloro-6,7-dimethyl-quinoline-3-carbonitrile REF: 3D-VDA10422CAS: 95104-22-6	Min. 95%	A consultar	Mar 07 Ene 25
Ethyl 5-hydroxymethyl-3-methylisoxazole-4-carboxylate REF: 3D-VDA10440CAS: 95104-40-8	Min. 95%	A consultar	Mar 07 Ene 25

25mg		245,00 €
250mg		974,00 €

10mg		230,00 €
100mg		914,00 €

1g		1.060,00 €
100mg		266,00 €

5mg		383,00 €
50mg		1.526,00 €

Building Blocks

Subcategorías de "Building Blocks"

Ácidos borónicos y derivados del ácido borónico

Building Blocks quirales

Building Blocks de hidrocarburos

Building Blocks orgánicos

Productos de "Building Blocks"

tert-Butyl 3-(1-amino-2-methoxy-2-oxoethyl)piperidine-1-carboxylate

Ref: 3D-UYB38030

Ethyl 4-methylpyrrolidine-2-carboxylate hydrochloride

Ref: 3D-UYB38353

ethyl 4-benzylmorpholine-3-carboxylate

Ref: 3D-UYB38386

Fmoc-3-fluoro-DL-tyrosine

Ref: 3D-UYB38996

3-(Dimethylamino)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

Ref: 3D-UYB39160

N-(N-Butyl)deoxygalactonojirimycin

Ref: 3D-UYB39358

2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-(5-chloro-1H-indol-3-yl)propanoicacid

Ref: 3D-UYB39851

6-Amino-5,6-dihydroimidazo[1,2-a]pyrimidin-7(8H)-one

Ref: 3D-UYB40660

Methyl amino(2-bromophenyl)acetate hydrochloride

Ref: 3D-UYB40844

Boc-beta-cyclopenten-1-yl-DL-alanine

Ref: 3D-UYB41102

2-{[(9H-Fluoren-9-yl)methoxy]carbonyl}-6-methoxy-1H,2H,3H,4H,9H-pyrido[3,4-b]indole-1-carboxylic acid

Ref: 3D-UYB41681

3-cyclopentyl-2-({[(9h-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

Ref: 3D-UYB42204

4-Benzylpiperazine-2-carboxylic acid hydrochloride

Ref: 3D-UYB42376

1,3-Dimethylpiperazin-2-one hydrochloride

Ref: 3D-UYB42522

Amino(cyclopropyl)acetic acid HCl

Ref: 3D-UYB42981

2-(tert-Butoxycarbonyl)-2-azabicyclo[3.1.0]hexane-3-carboxylic acid

Ref: 3D-UYB43061

(2R)-2-{[(tert-Butoxy)carbonyl]amino}propanethioic S-acid

Ref: 3D-UYB45297

3-Methyl-1-(4-methylphenyl)butan-1-amine hydrochloride

Ref: 3D-UYB45577

1-(2-Fluorophenyl)-3-methylbutan-1-amine hydrochloride

Ref: 3D-UYB45578

1-(3-Fluorophenyl)-3-methylbutan-1-amine hydrochloride

Ref: 3D-UYB45587

2-Cyclopropyl-6-oxo-1,6-dihydropyrimidine-5-carboxylic acid

Ref: 3D-UYB56135

1-Cyclopropyl-5-oxo-2-phenylpyrrolidine-3-carboxylic acid

Ref: 3D-UYB57156

3-(4-Fluorophenyl)-1,2,4-oxadiazol-5-amine

Ref: 3D-UYB58494

(2R,3S)-4-{[(9H-Fluoren-9-yl)methoxy]carbonyl}-2-methylmorpholine-3-carboxylic acid

Ref: 3D-UYB60331

4-(Prop-2-yn-1-yl)piperazin-2-one

Ref: 3D-UYB60629

Methyl 4-(4-formylphenyl)benzoate

Ref: 3D-VCA91689

2-(1,2,3,4-Tetrahydroisoquinolin-3-yl)ethan-1-ol

Ref: 3D-VCA91784

1-N-(Propan-2-yl)benzene-1,2-diamine

Ref: 3D-VCA91895

Methyl 2,4,6-trimethylbenzenesulfonate

Ref: 3D-VCA92059

N-[2-(4-Pyridinyl)ethyl]-acetamide

Ref: 3D-VCA92239

[(4-Fluorophenyl)thio]acetyl chloride

Ref: 3D-VCA93209

N-(3-Ethynylphenyl)acetamide

Ref: 3D-VCA93358

2-Amino-6H,7H,8H,9H,11H-pyrido[2,1-b]quinazolin-11-one

Ref: 3D-VCA93409

Methyl 4-(2,5-dimethoxyphenyl)-2,4-dioxobutanoate

Ref: 3D-VCA93515

4-Ethyl-3-nitro-pyridin-2-ylamine

Ref: 3D-VCA93616

1H-1,2,3-Benzotriazole-5-carbaldehyde

Ref: 3D-VCA93842

4-Bromo-1-ethyl-3-nitro-1H-pyrazole