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Impurities & Reference Standards

API Impurities

Source 1942 api impurities for research, QC and production, documented with COA and SDS.

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Reference Standard

4-Benzyloxy-3-nitroacetophenone chemical structure

4-Benzyloxy-3-nitroacetophenone

CAS: 14347-05-8
Formula: C₁₅H₁₃NO₄
MW: 271.27 g/mol

VQ-040890

Reference Standard

4-Bromo N-methylaniline chemical structure

4-Bromo N-methylaniline

CAS: 6911-87-1
Formula: C₇H₈BrN
MW: 186.05 g/mol

VQ-039385

Reference Standard

4-Bromo Olivetol chemical structure

4-Bromo Olivetol

CAS: 78463-35-1
Formula: C₁₁H₁₅BrO₂
MW: 259.14 g/mol

VQ-036121

Reference Standard

4-Bromo-1-(1-ethoxyethyl)-1H-pyrazole chemical structure

4-Bromo-1-(1-ethoxyethyl)-1H-pyrazole

CAS: 1024120-52-2
Formula: C₇H₁₁BrN₂O
MW: 219.08 g/mol

VQ-027208

Reference Standard

4-Bromo-1-Butene chemical structure

4-Bromo-1-Butene

CAS: 5162-44-7
Formula: C₄H₇Br
MW: 135 g/mol

VQ-032571

Reference Standard

4-Bromo-1-chloro-2-(4-fluorobenzyl)benzene chemical structure

4-Bromo-1-chloro-2-(4-fluorobenzyl)benzene

CAS: 1628918-33-1
Formula: C₁₃H₉BrClF
MW: 299.56 g/mol

VQ-030456

Reference Standard

4-Bromo-1-chloro-2-[(2-ethoxyphenyl)methyl]benzene chemical structure

4-Bromo-1-chloro-2-[(2-ethoxyphenyl)methyl]benzene

CAS: 1830346-16-1
Formula: C₁₅H₁₄BrClO
MW: 325.63 g/mol

VQ-025170

Reference Standard

4-Bromo-1-cyclohexyl-2-trifluoromethyl-benzene chemical structure

4-Bromo-1-cyclohexyl-2-trifluoromethyl-benzene

CAS: 1449291-53-5
Formula: C₁₃H₁₄BrF₃
MW: 307.15 g/mol

VQ-044798

Reference Standard

4-Bromo-2-(1,1,1-trifluoro-2-methylpropan-2-yl)pyridine chemical structure

4-Bromo-2-(1,1,1-trifluoro-2-methylpropan-2-yl)pyridine

CAS: 1357476-67-5
Formula: C₉H₉BrF₃N
MW: 268.07 g/mol

VQ-035419

Reference Standard

4-Bromo-2-chlorobenzoic Acid chemical structure

4-Bromo-2-chlorobenzoic Acid

CAS: 59748-90-2
Formula: C₇H₄BrClO₂
MW: 235.46 g/mol

VQ-032638

Reference Standard

4-Bromo-2-fluorobenzaldehyde chemical structure

4-Bromo-2-fluorobenzaldehyde

CAS: 57848-46-1
Formula: C₇H₄BrFO
MW: 203.01 g/mol

VQ-040639

Reference Standard

4-Bromo-2-fluorobenzamide chemical structure

4-Bromo-2-fluorobenzamide

CAS: 292621-45-5
Formula: C₇H₅BrFNO
MW: 218.02 g/mol

VQ-048226

Reference Standard

4-Bromo-2-nitroanisole chemical structure

4-Bromo-2-nitroanisole

CAS: 33696-00-3
Formula: C₇H₆BrNO₃
MW: 232.03 g/mol

VQ-048177

Reference Standard

4-Bromo-2-nitrophenol chemical structure

4-Bromo-2-nitrophenol

CAS: 7693-52-9
Formula: C₆H₄BrNO₃
MW: 218 g/mol

VQ-036960

Reference Standard

4-Bromo-3-methyl[1,1'-biphenyl]-2-carbonitrile chemical structure

4-Bromo-3-methyl[1,1'-biphenyl]-2-carbonitrile

CAS: 1284227-57-1
Formula: C₁₄H₁₀BrN
MW: 272.14 g/mol

VQ-037734

Reference Standard

4-Bromobutyl 3,4-dimethoxybenzoate

4-Bromobutyl 3,4-dimethoxybenzoate

CAS: 1260668-38-9
Formula: C₁₃H₁₇BrO₄
MW: 317.18 g/mol

VQ-031748

Reference Standard

4-Butoxyphenol chemical structure

CAS: 122-94-1
Formula: C₁₀H₁₄O₂
MW: 166.22 g/mol

VQ-041588

Reference Standard

4-Butyramido-3-methylbenzoic acid chemical structure

4-Butyramido-3-methylbenzoic acid

CAS: 1016696-74-4
Formula: C₁₂H₁₅NO₃
MW: 221.25 g/mol

VQ-042393

Reference Standard

4-Carboxy-a-methylbenzeneacetic Acid chemical structure

4-Carboxy-a-methylbenzeneacetic Acid

CAS: 67381-50-4
Formula: C₁₀H₁₀O₄
MW: 194.18 g/mol

VQ-026122

Reference Standard

4-Carboxybenzyl bromide chemical structure

4-Carboxybenzyl bromide

CAS: 6232-88-8
Formula: C₈H₇BrO₂
MW: 215.04 g/mol

VQ-027144

Reference Standard

4-Carboxyphenylboronic acid chemical structure

4-Carboxyphenylboronic acid

CAS: 14047-29-1
Formula: C₇H₇BO₄
MW: 165.94 g/mol

VQ-032573

Reference Standard

4-Chloro Bupropion chemical structure

4-Chloro Bupropion

CAS: 1193779-34-8
Formula: C₁₃H₁₇Cl₂NO
MW: 274.18 g/mol

VQ-024695

Reference Standard

4-Chloro Bupropion Fumarate chemical structure

4-Chloro Bupropion Fumarate

CAS: 1193779-36-0
Formula: C₁₇H₂₁Cl₂NO₅
MW: 390.3 g/mol

VQ-024694

Reference Standard

4-Chloro Bupropion Hydrochloride chemical structure

4-Chloro Bupropion Hydrochloride

CAS: 1346598-72-8
Formula: C₁₃H₁₈Cl₃NO
MW: 310.6 g/mol

VQ-024688

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