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
- 20
- 50
- 200

productos por página. Hay 263118 productos en esta categoría.

Datos del producto	Pureza	Rango de precios	Entrega estimada
5-(2,5-Dimethylphenoxy)pentanoic acid REF: 3D-TSA92474CAS: 443924-74-1	Min. 95%	A consultar	Mié 13 Nov 24
3-(4-Fluorophenyl)-4-phenyl-1,2-oxazol-5-amine REF: 3D-STB28809CAS: 1092288-09-9	Min. 95%	A consultar	Mié 13 Nov 24
5-Azetidin-3-yl-3-(2-thienyl)-1,2,4-oxadiazole hydrochloride REF: 3D-LBC70863CAS: 1286708-63-1	Min. 95%	A consultar	Mié 13 Nov 24
2-(Benzyloxy)-4-methylphenylboronic acid REF: 3D-LZB30473CAS: 1236304-73-6	Min. 95%	A consultar	Mié 13 Nov 24
5-Chloro-2,4-dimethoxypyridine REF: 3D-CZB57119CAS: 1227571-19-8	Min. 95%	A consultar	Mié 13 Nov 24
4-(5-Methylpyrrolidin-3-yl)morpholine REF: 3D-DXC58799CAS: 1803587-99-6	Min. 95%	A consultar	Mié 13 Nov 24
1-(2-Bromophenyl)-3-methylbutan-2-one REF: 3D-IXB05047CAS: 1183050-47-6	Min. 95%	A consultar	Mié 13 Nov 24
5-Bromo-2-methylamino-nicotinic acid REF: 3D-KZA27981CAS: 610279-81-7	Min. 95%	A consultar	Mié 13 Nov 24
Ethyl(oxolan-3-ylmethyl)amine REF: 3D-QGA25330CAS: 165253-30-5	Min. 95%	A consultar	Mié 13 Nov 24
4-(2,4-Dinitrophenoxy)-3-methoxybenzaldehyde REF: 3D-DAA76130CAS: 3761-30-6	Min. 95%	A consultar	Mié 13 Nov 24
3-Ethyl-2-methylpyrrolidine hydrochloride REF: 3D-XWC32232CAS: 1797322-32-7	Min. 95%	A consultar	Mié 13 Nov 24
3-Ethoxybenzene-1,2-diamine REF: 3D-RHA84971CAS: 191849-71-5	Min. 95%	A consultar	Mié 13 Nov 24
2-Phenyl-1,3-thiazole-4-sulfonamide REF: 3D-DXC60110CAS: 1803601-10-6	Min. 95%	A consultar	Mié 13 Nov 24
rac-(1R,3R)-2,2-Dimethyl-3-phenylcyclopropane-1-carboxylic acid REF: 3D-ZDA64769CAS: 99647-69-5	Min. 95%	A consultar	Mié 13 Nov 24
5-(2,2-Dimethylpropyl)-1H-pyrazol-3-amine REF: 3D-CQA07977CAS: 377079-77-1	Min. 95%	A consultar	Mié 13 Nov 24
3,3,3-Trifluoro-2,2-dimethylpropanimidamide hydrochloride REF: 3D-SYB48748CAS: 1217487-48-3	Min. 95%	A consultar	Mié 13 Nov 24
2-((2,6-Difluorophenoxy)methyl)-1,3-dioxolane REF: 3D-THC35397CAS: 1443353-97-6	Min. 95%	A consultar	Mié 13 Nov 24
N-(2,2,2-Trifluoroethyl)-1H-imidazole-1-carboxamide REF: 3D-WRB86147CAS: 1046861-47-5	Min. 95%	A consultar	Mié 13 Nov 24
3-Chloro-5-t-butyldimethylsilyloxyphenylboronic acid pinacol ester REF: 3D-TYB78946CAS: 1218789-46-8	Min. 95%	A consultar	Mié 13 Nov 24
5-Nitro-2-(propan-2-ylsulfanyl)benzoic acid REF: 3D-XKB37712CAS: 897377-12-7	Min. 95%	A consultar	Mié 13 Nov 24
3-{[4-Bromo-3,5-bis(difluoromethyl)-1H-pyrazol-1-yl]methyl}-4-methoxybenzaldehyde REF: 3D-FQB63219CAS: 1005632-19-8	Min. 95%	A consultar	Mié 13 Nov 24
2-Ethyloxane-4-carbaldehyde REF: 3D-QEA60297CAS: 115602-97-6	Min. 95%	A consultar	Mié 13 Nov 24
2-{[5-(1,3-Dioxaindan-5-yl)-1,2-oxazol-3-yl]methoxy}acetic acid REF: 3D-TQB12822CAS: 1018128-22-7	Min. 95%	A consultar	Mié 13 Nov 24
2-Amino-4,5-dimethoxyphenol hydrochloride REF: 3D-TUD87178CAS: 2368871-78-5	Min. 95%	A consultar	Mié 13 Nov 24
Ethyl 5-amino-4-fluoro-2-methylbenzoate REF: 3D-RMC14455CAS: 1566144-55-5	Min. 95%	A consultar	Mié 13 Nov 24
2-Amino-4-ethylphenol hydrochloride REF: 3D-EDA50990CAS: 79509-90-3	Min. 95%	A consultar	Mié 13 Nov 24
1,3-Dichloroimidazo[1,5-a]pyrazine REF: 3D-GCA48140CAS: 56481-40-4	Min. 95%	A consultar	Mié 13 Nov 24
2-(1-Hydroxyethyl)cyclopropane-1-carboxylic acid REF: 3D-XCA43683CAS: 72436-83-0	Min. 95%	A consultar	Mié 13 Nov 24
rac-tert-Butyl N-[(1R,5S)-3-azabicyclo[3.1.0]hexan-1-yl]carbamate REF: 3D-VAD87072CAS: 1895870-72-0	Min. 95%	A consultar	Mié 13 Nov 24
2,5-Dimethyl-N-(prop-2-en-1-yl)benzene-1-sulfonamide REF: 3D-ZEB92068CAS: 749920-68-1	Min. 95%	A consultar	Mié 13 Nov 24
2-(Methanesulfonylmethyl)-1H-1,3-benzodiazole REF: 3D-ZAA09275CAS: 24092-75-9	Min. 95%	A consultar	Mié 13 Nov 24
5-(4-Methyl-piperidin-1-yl)-5-oxo-pentanoic acid REF: 3D-LSA08710CAS: 436087-10-4	Min. 95%	A consultar	Mié 13 Nov 24
(4-Ethyl-benzyl)-pyridin-3-ylmethyl-amine REF: 3D-LSA09679CAS: 436096-79-6	Min. 95%	A consultar	Mié 13 Nov 24
4-(1-Ethyl-3-methyl-1H-pyrazol-4-yl)-2-mercapto-6-trifluoromethyl-nicotinonitrile REF: 3D-BQB51933CAS: 1001519-33-0	Min. 95%	A consultar	Mié 13 Nov 24
2-[(Methylamino)methyl]benzyl alcohol REF: 3D-HCA68524CAS: 57685-24-2	Min. 95%	A consultar	Mié 13 Nov 24
1-(2,4-Difluorophenyl)-3-(methylsulfanyl)propan-2-amine hydrochloride REF: 3D-RPD13075CAS: 2241130-75-4	Min. 95%	A consultar	Mié 13 Nov 24
5-Hydroxy-2-(trifluoromethoxy)benzoic acid REF: 3D-BJB34157CAS: 851341-57-6	Min. 95%	A consultar	Mié 13 Nov 24
(1-(Sec-butyl)piperidin-4-yl)methanamine REF: 3D-XZB40953CAS: 1247409-53-5	Min. 95%	A consultar	Mié 13 Nov 24
5-Bromo-2-chloro-4-fluorobenzene-1-sulfonyl chloride REF: 3D-YUB30706CAS: 1123307-06-1	Min. 95%	A consultar	Mié 13 Nov 24
Fluoren-3-ol-d9 (major) REF: 3D-GAA34467CAS: 6344-67-8	Min. 95%	A consultar	Mié 13 Nov 24
7-Fluoro-1H-indazol-6-ol REF: 3D-NQC76418CAS: 1638764-18-7	Min. 95%	A consultar	Mié 13 Nov 24
N-Methyl-3-(3-methylphenoxy)-1-propanamine REF: 3D-QLB92300CAS: 915923-00-1	Min. 95%	A consultar	Mié 13 Nov 24
rac-(2R,3R)-1-[(tert-Butoxy)carbonyl]-2-cyclopropylpiperidine-3-carboxylic acid REF: 3D-NKD03404CAS: 2138034-04-3	Min. 95%	A consultar	Mié 13 Nov 24
4-Methoxynaphthalene-1-Sulfonyl Chloride REF: 3D-GCA87555CAS: 56875-55-9	Min. 95%	A consultar	Mié 13 Nov 24
5-(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)pentanoic acid REF: 3D-HCA07899CAS: 57078-99-6	Min. 95%	A consultar	Mié 13 Nov 24
9-Imino-1-oxa-9λ⁶-thia-4-azaspiro[5.5]undecan-9-one dihydrochloride REF: 3D-LUD63536CAS: 2361635-36-9	Min. 95%	A consultar	Mié 13 Nov 24
5-(Difluoromethyl)-2,3,4,5-tetrahydro-1,4-benzoxazepine hydrochloride REF: 3D-LUD72555CAS: 2361725-55-3	Min. 95%	A consultar	Mié 13 Nov 24
1-({2,3-Dicyanoimidazo[1,2-a]pyrimidin-6-yl}sulfanyl)-N,N-dimethylformamide REF: 3D-KZB44173CAS: 1235441-73-2	Min. 95%	A consultar	Mié 13 Nov 24
(5-Methoxy-1H-indol-3-yl)methanol REF: 3D-CDA41978CAS: 77419-78-4	Min. 95%	A consultar	Mié 13 Nov 24
1-(4-Bromo-phenoxymethyl)-3,5-dimethyl-4-nitro-1H-pyrazole REF: 3D-BQB51906CAS: 1001519-06-7	Min. 95%	A consultar	Mié 13 Nov 24
(3-Ethyl-4-fluorophenyl)methanamine REF: 3D-UJB29731CAS: 869297-31-4	Min. 95%	A consultar	Mié 13 Nov 24
4-{[1,2,4]Triazolo[4,3-a]pyridin-3-ylmethyl}aniline REF: 3D-RQB83914CAS: 1016839-14-7	Min. 95%	A consultar	Mié 13 Nov 24
5-Formyl-N,N-dimethylpyrazole-1-sulfonamide REF: 3D-RRB42194CAS: 1041421-94-6	Min. 95%	A consultar	Mié 13 Nov 24
N-tert-Butyl-4-chloropyridine-2-carboxamide REF: 3D-HQB20776CAS: 1007207-76-2	Min. 95%	A consultar	Mié 13 Nov 24
3-(Pentyloxy)-benzenemethanol REF: 3D-WQB09628CAS: 1021096-28-5	Min. 95%	A consultar	Mié 13 Nov 24
1-(Cyclopropylmethyl)-5-iodopyrazole REF: 3D-VDC47139CAS: 1345471-39-7	Min. 95%	A consultar	Mié 13 Nov 24
3-[(tert-Butyldimethylsilyl)oxy]pentanal REF: 3D-GFA04992CAS: 131049-92-8	Min. 95%	A consultar	Mié 13 Nov 24
1-(2-hydroxyethyl)piperazin-2-one hydrochloride REF: 3D-KLB57307CAS: 910573-07-8	Min. 95%	A consultar	Mié 13 Nov 24
4-[4-(Tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-1H-pyrazole REF: 3D-GFB52075CAS: 756520-75-9	Min. 95%	A consultar	Mié 13 Nov 24
3,4-Dihydro-1H-2-benzopyran-1-carboxamide REF: 3D-KJB36880CAS: 860368-80-5	Min. 95%	A consultar	Mié 13 Nov 24
5-Methoxy-furan-2-carboxylic acid REF: 3D-UDA08462CAS: 94084-62-5	Min. 95%	A consultar	Mié 13 Nov 24
2-(Pentan-3-yl)piperidine REF: 3D-DEA90620CAS: 103906-20-3	Min. 95%	A consultar	Mié 13 Nov 24
2-(3-Fluorophenoxy)aniline REF: 3D-QAB76667CAS: 640766-67-2	Min. 95%	A consultar	Mié 13 Nov 24
6-Amino-5-(4-phenyl-1,3-thiazol-2-yl)-2-sulfanylpyridine-3-carbonitrile REF: 3D-BJB87912CAS: 851879-12-4	Min. 95%	A consultar	Mié 13 Nov 24
Cyclopropyl-(1-ethyl-4-nitro-1H-pyrazol-3-yl)-amine REF: 3D-EHC41809CAS: 1429418-09-6	Min. 95%	A consultar	Mié 13 Nov 24
1-[(tert-Butoxy)carbonyl]-3-(2-oxopropyl)pyrrolidine-3-carboxylic acid REF: 3D-PAD13624CAS: 1889136-24-6	Min. 95%	A consultar	Mié 13 Nov 24
Bicyclo[4.1.0]heptan-3-amine hydrochloride REF: 3D-DDA29349CAS: 78293-49-9	Min. 95%	A consultar	Mié 13 Nov 24
(4-Aminophenyl)(1-azepanyl)methanone REF: 3D-FAA15766CAS: 5157-66-4	Min. 95%	A consultar	Mié 13 Nov 24
1-(2-Aminopropoxy)-2-bromobenzene REF: 3D-TQB66279CAS: 1018662-79-7	Min. 95%	A consultar	Mié 13 Nov 24
4-Bromo-1-phenyl-1H-pyrazole-3-carboxylic acid REF: 3D-GWB39245CAS: 1156392-45-8	Min. 95%	A consultar	Mié 13 Nov 24
4-(4-Nitrophenoxy)piperidine hydrochloride REF: 3D-YFA50545CAS: 148505-45-7	Min. 95%	A consultar	Mié 13 Nov 24
Methyl chroman-2-carboxylic acid REF: 3D-NEA77158CAS: 113771-58-7	Min. 95%	A consultar	Mié 13 Nov 24
[(1-Benzyl-1H-imidazol-2-yl)methyl]amine dihydrochloride REF: 3D-XAA60075CAS: 22600-75-5	Min. 95%	A consultar	Mié 13 Nov 24
2-[3-(Trifluoromethyl)-1H-pyrazol-5-yl]acetic acid REF: 3D-ZEC03237CAS: 1374032-37-7	Min. 95%	A consultar	Mié 13 Nov 24
2-(3-Chloropropyl)pyridine hydrochloride REF: 3D-SAA94457CAS: 17944-57-9	Min. 95%	A consultar	Mié 13 Nov 24
3-(Trimethylsilyl)ethynylbenzaldehyde REF: 3D-CDA12355CAS: 77123-55-8	Min. 95%	A consultar	Mié 13 Nov 24
methyl 2-(5-methylpyridin-3-yl)acetate REF: 3D-GAC80464CAS: 1256804-64-4	Min. 95%	A consultar	Mié 13 Nov 24
5-Bromoquinoline-6-carboxylic acid REF: 3D-VMB47048CAS: 945470-48-4	Min. 95%	A consultar	Mié 13 Nov 24
2-Azido-N-(4-fluorophenyl)acetamide REF: 3D-KWB74808CAS: 1160748-08-2	Min. 95%	A consultar	Mié 13 Nov 24
3-Bromo-4H,5H,6H,7H-pyrazolo[1,5-a]pyrazine REF: 3D-NAC37890CAS: 1263378-90-0	Min. 95%	A consultar	Mié 13 Nov 24
5-(Hydroxymethyl)-4-phenylpyrrolidin-2-one REF: 3D-IFA39088CAS: 133390-88-2	Min. 95%	A consultar	Mié 13 Nov 24
2-Chloroethyl Propyl Ether REF: 3D-SBA14974CAS: 42149-74-6	Min. 95%	A consultar	Mié 13 Nov 24
1-Ethyl-2-methyl-1H-imidazole-4-sulfonyl chloride REF: 3D-UDC29601CAS: 1344296-01-0	Min. 95%	A consultar	Mié 13 Nov 24
N,2,6-Trimethyloxan-4-amine REF: 3D-ULC89296CAS: 1544892-96-7	Min. 95%	A consultar	Mié 13 Nov 24
tert-Butyl spiro[1,2-dihydroindole-3,3'-piperidine]-1'-carboxylate REF: 3D-HJB67752CAS: 857677-52-2	Min. 95%	A consultar	Mié 13 Nov 24
Sodium 5-Formyl-2-furansulfonate REF: 3D-GBA79544CAS: 31795-44-5	Min. 95%	A consultar	Mié 13 Nov 24
tert-Butyl 6-nitro-3,4-dihydroisoquinoline-2(1H)-carboxylate REF: 3D-LHA39079CAS: 186390-79-4	Min. 95%	A consultar	Mié 13 Nov 24
rac-[(3R,4R)-4-(Hydroxymethyl)pyrrolidin-3-yl]methanol hydrochloride REF: 3D-JPC40908CAS: 1609409-08-6	Min. 95%	A consultar	Mié 13 Nov 24
3-Amino-N-benzylpropanamide hydrochloride REF: 3D-CIA81953CAS: 202819-53-2	Min. 95%	A consultar	Mié 13 Nov 24
2-{[3-(Pyridin-3-yl)-1,2,4-oxadiazol-5-yl]sulfanyl}acetic acid REF: 3D-KCC23589CAS: 1310235-89-2	Min. 95%	A consultar	Mié 13 Nov 24
3-Methoxy-1,2-thiazole-5-sulfonyl chloride REF: 3D-JCD40492CAS: 1934404-92-8	Min. 95%	A consultar	Mié 13 Nov 24
(2,3,5,6-Tetrafluorophenyl)methanamine hydrochloride REF: 3D-IGA38851CAS: 158388-51-3	Min. 95%	A consultar	Mié 13 Nov 24
tert-Butyl 3-[methoxy(methyl)carbamoyl]azetidine-1-carboxylate REF: 3D-VHB97167CAS: 820971-67-3	Min. 95%	A consultar	Mié 13 Nov 24
2,5-Dicyclopropyl-1H-pyrrole-3-carboxylic acid REF: 3D-UID50510CAS: 2094505-10-7	Min. 95%	A consultar	Mié 13 Nov 24
3-Isopropylamino-pyrrolidine-1-carboxylic acid tert-butyl ester REF: 3D-PBC38505CAS: 1289385-05-2	Min. 95%	A consultar	Mié 13 Nov 24
1-[(tert-butoxy)carbonyl]-3-(trifluoromethyl)pyrrolidine-3-carboxylic acid REF: 3D-KAC78023CAS: 1260780-23-1	Min. 95%	A consultar	Mié 13 Nov 24
methyl 2-amino-3-iodobenzoate REF: 3D-FHA16160CAS: 180161-60-8	Min. 95%	A consultar	Mié 13 Nov 24
7,9-Dimethyl-2,3,4,5-tetrahydro-1-benzoxepin-5-one REF: 3D-GIA43579CAS: 206435-79-2	Min. 95%	A consultar	Mié 13 Nov 24
(R)-Octahydro-pyrido-1,2-apyrazin-4-one REF: 3D-MXB92990CAS: 1187929-90-3	Min. 95%	A consultar	Mié 13 Nov 24
(2E)-3-(2,4-Difluoro-5-methylphenyl)prop-2-enoic acid REF: 3D-MMC31133CAS: 1562311-33-4	Min. 95%	A consultar	Mié 13 Nov 24

1g		878,00 €
100mg		222,00 €

50mg		333,00 €
500mg		1.251,00 €

10mg		290,00 €
100mg		1.085,00 €

1g		878,00 €
100mg		222,00 €

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"

5-(2,5-Dimethylphenoxy)pentanoic acid

Ref: 3D-TSA92474

3-(4-Fluorophenyl)-4-phenyl-1,2-oxazol-5-amine

Ref: 3D-STB28809

5-Azetidin-3-yl-3-(2-thienyl)-1,2,4-oxadiazole hydrochloride

Ref: 3D-LBC70863

2-(Benzyloxy)-4-methylphenylboronic acid

Ref: 3D-LZB30473

5-Chloro-2,4-dimethoxypyridine

Ref: 3D-CZB57119

4-(5-Methylpyrrolidin-3-yl)morpholine

Ref: 3D-DXC58799

1-(2-Bromophenyl)-3-methylbutan-2-one

Ref: 3D-IXB05047

5-Bromo-2-methylamino-nicotinic acid

Ref: 3D-KZA27981

Ethyl(oxolan-3-ylmethyl)amine

Ref: 3D-QGA25330

4-(2,4-Dinitrophenoxy)-3-methoxybenzaldehyde

Ref: 3D-DAA76130

3-Ethyl-2-methylpyrrolidine hydrochloride

Ref: 3D-XWC32232

3-Ethoxybenzene-1,2-diamine

Ref: 3D-RHA84971

2-Phenyl-1,3-thiazole-4-sulfonamide

Ref: 3D-DXC60110

rac-(1R,3R)-2,2-Dimethyl-3-phenylcyclopropane-1-carboxylic acid

Ref: 3D-ZDA64769

5-(2,2-Dimethylpropyl)-1H-pyrazol-3-amine

Ref: 3D-CQA07977

3,3,3-Trifluoro-2,2-dimethylpropanimidamide hydrochloride

Ref: 3D-SYB48748

2-((2,6-Difluorophenoxy)methyl)-1,3-dioxolane

Ref: 3D-THC35397

N-(2,2,2-Trifluoroethyl)-1H-imidazole-1-carboxamide

Ref: 3D-WRB86147

3-Chloro-5-t-butyldimethylsilyloxyphenylboronic acid pinacol ester

Ref: 3D-TYB78946

5-Nitro-2-(propan-2-ylsulfanyl)benzoic acid

Ref: 3D-XKB37712

3-{[4-Bromo-3,5-bis(difluoromethyl)-1H-pyrazol-1-yl]methyl}-4-methoxybenzaldehyde

Ref: 3D-FQB63219

2-Ethyloxane-4-carbaldehyde

Ref: 3D-QEA60297

2-{[5-(1,3-Dioxaindan-5-yl)-1,2-oxazol-3-yl]methoxy}acetic acid

Ref: 3D-TQB12822

2-Amino-4,5-dimethoxyphenol hydrochloride

Ref: 3D-TUD87178

Ethyl 5-amino-4-fluoro-2-methylbenzoate

Ref: 3D-RMC14455

2-Amino-4-ethylphenol hydrochloride

Ref: 3D-EDA50990

1,3-Dichloroimidazo[1,5-a]pyrazine

Ref: 3D-GCA48140

2-(1-Hydroxyethyl)cyclopropane-1-carboxylic acid

Ref: 3D-XCA43683

rac-tert-Butyl N-[(1R,5S)-3-azabicyclo[3.1.0]hexan-1-yl]carbamate

Ref: 3D-VAD87072

2,5-Dimethyl-N-(prop-2-en-1-yl)benzene-1-sulfonamide

Ref: 3D-ZEB92068

2-(Methanesulfonylmethyl)-1H-1,3-benzodiazole

Ref: 3D-ZAA09275

5-(4-Methyl-piperidin-1-yl)-5-oxo-pentanoic acid

Ref: 3D-LSA08710

(4-Ethyl-benzyl)-pyridin-3-ylmethyl-amine

Ref: 3D-LSA09679

4-(1-Ethyl-3-methyl-1H-pyrazol-4-yl)-2-mercapto-6-trifluoromethyl-nicotinonitrile

Ref: 3D-BQB51933

2-[(Methylamino)methyl]benzyl alcohol

Ref: 3D-HCA68524

1-(2,4-Difluorophenyl)-3-(methylsulfanyl)propan-2-amine hydrochloride

Ref: 3D-RPD13075

5-Hydroxy-2-(trifluoromethoxy)benzoic acid