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Impurities & Reference Standards

Pharmacopoeial and non-pharmacopoeial impurities, metabolites, nitrosamines and working standards with characterisation data for QC and regulatory work.

28,554products

6sub-categories

2,746in stock

COA + SDSwith every lot

API Impurities 14,252 Pharmacopeial Impurities (EP / USP / BP) 4,401 Nitrosamine Impurities 650 Stable Isotope Labelled Standards (Deuterated, 13C, 15N) 1,612 Metabolites & Degradation Products 4,146 API Reference Standards 3,493

Reference Standard

4-[(7-Chloro-4-quinolinyl)imino]-2-[(diethylamino)methyl]-2,5-cyclohexadien-1-one chemical structure

4-[(7-Chloro-4-quinolinyl)imino]-2-[(diethylamino)methyl]-2,5-cyclohexadien-1-one

CAS: 112430-12-3
Formula: C₂₀H₂₀ClN₃O
MW: 353.8 g/mol

VQ-035350

Reference Standard

4-[(Aminocarbonyl)amino]-D-phenylalanine chemical structure

4-[(Aminocarbonyl)amino]-D-phenylalanine

CAS: 1808153-79-8
Formula: C₁₀H₁₃N₃O₃
MW: 223.23 g/mol

VQ-036610

Reference Standard

4-[(Z)-(2-Chloro-4-hydroxyphenyl)diazenyl]benzene-1-sulfonic acid chemical structure

4-[(Z)-(2-Chloro-4-hydroxyphenyl)diazenyl]benzene-1-sulfonic acid

CAS: 253801-34-2
Formula: C₁₂H₉ClN₂O₄S
MW: 312.73 g/mol

VQ-034297

Reference Standard

4-[[(2-Amino-3,5-dibromophenyl)methylene]amino]cyclohexanol chemical structure

4-[[(2-Amino-3,5-dibromophenyl)methylene]amino]cyclohexanol

CAS: 1445719-53-8
Formula: C₁₃H₁₆Br₂N₂O
MW: 376.09 g/mol

VQ-035674

Reference Standard

4-[[(Hexahydro-2,6-dioxo-4-pyrimidinyl)carbonyl]amino]-L-phenylalanine chemical structure

4-[[(Hexahydro-2,6-dioxo-4-pyrimidinyl)carbonyl]amino]-L-phenylalanine

CAS: 1808153-80-1
Formula: C₁₄H₁₆N₄O₅
MW: 320.3 g/mol

VQ-036609

Reference Standard

4-[[2-(Octyloxy)benzoyl]amino]benzoic Acid 2-(Diethylamino)ethyl Ester chemical structure

4-[[2-(Octyloxy)benzoyl]amino]benzoic Acid 2-(Diethylamino)ethyl Ester

CAS: 26090-29-9
Formula: C₂₈H₄₀N₂O₄
MW: 468.6 g/mol

VQ-041250

Reference Standard

4-[[2-Ethoxy-5-[(4-methyl-1-piperazinyl)- sulfonyl]benzoyl]amino]-1-methyl-3-propyl- 1H-pyrazole-5-carboxamide chemical structure

4-[[2-Ethoxy-5-[(4-methyl-1-piperazinyl)- sulfonyl]benzoyl]amino]-1-methyl-3-propyl- 1H-pyrazole-5-carboxamide

CAS: 200575-15-1
Formula: C₂₂H₃₂N₆O₅S
MW: 492.6 g/mol

VQ-028022

Reference Standard

4-[[3-(4-Methylphenyl)-3-oxo-1-(trifluoromethyl)propylidene]amino]benzenesulfonamide chemical structure

4-[[3-(4-Methylphenyl)-3-oxo-1-(trifluoromethyl)propylidene]amino]benzenesulfonamide

CAS: 1061214-09-2
Formula: C₁₇H₁₅F₃N₂O₃S
MW: 384.4 g/mol

VQ-021121

Reference Standard

4-[[3-[2-(3-Chlorophenyl)ethyl]-2-pyridinyl]carbonyl]-1-piperidinecarboxylic Acid Ethyl Ester chemical structure

4-[[3-[2-(3-Chlorophenyl)ethyl]-2-pyridinyl]carbonyl]-1-piperidinecarboxylic Acid Ethyl Ester

CAS: 107256-32-6
Formula: C₂₂H₂₅ClN₂O₃
MW: 400.9 g/mol

VQ-031634

Reference Standard

4-[[5-[[(Cyclopentyloxy)carbonyl]amino]-1-methyl-1H-indol-3-yl]methyl]-3-methoxy-benzoic acid methyl ester chemical structure

4-[[5-[[(Cyclopentyloxy)carbonyl]amino]-1-methyl-1H-indol-3-yl]methyl]-3-methoxy-benzoic acid methyl ester

CAS: 107754-19-8
Formula: C₂₅H₂₈N₂O₅
MW: 436.5 g/mol

VQ-028769

Reference Standard

4-[[5-[[(Cyclopentyloxy)carbonyl]amino]-1-methyl-1H-indol-3-yl]methyl]-3-methoxybenzoic acid chemical structure

4-[[5-[[(Cyclopentyloxy)carbonyl]amino]-1-methyl-1H-indol-3-yl]methyl]-3-methoxybenzoic acid

CAS: 107754-20-1
Formula: C₂₄H₂₆N₂O₅
MW: 422.5 g/mol

VQ-034719

Reference Standard

4-[1-Hydroxy-2-(methylamino)ethyl]benzene-1,2,3-triol chemical structure

4-[1-Hydroxy-2-(methylamino)ethyl]benzene-1,2,3-triol

CAS: 2228339-18-0
Formula: C₉H₁₃NO₄
MW: 199.2 g/mol

VQ-045164

Reference Standard

4-[2-(1-Azepanyl)ethoxy]benzaldehyde chemical structure

4-[2-(1-Azepanyl)ethoxy]benzaldehyde

CAS: 223251-09-0
Formula: C₁₅H₂₁NO₂
MW: 247.33 g/mol

VQ-020898

Reference Standard

4-[2-(2-Amino-4,5,6,7-tetrahydro-4,6-dioxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoic Acid chemical structure

4-[2-(2-Amino-4,5,6,7-tetrahydro-4,6-dioxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoic Acid

CAS: 193265-47-3
Formula: C₁₅H₁₄N₄O₄
MW: 314.3 g/mol

VQ-041374

Reference Standard

4-[2-(2-Amino-4,7-dihydro-4-oxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoic Acid Methyl Ester chemical structure

4-[2-(2-Amino-4,7-dihydro-4-oxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoic Acid Methyl Ester

CAS: 155405-80-4
Formula: C₁₆H₁₆N₄O₃
MW: 312.32 g/mol

VQ-027415

Reference Standard

4-[2-(4-Nitro-1H-imidazol-1-yl)ethyl]morpholine chemical structure

4-[2-(4-Nitro-1H-imidazol-1-yl)ethyl]morpholine

CAS: 6497-78-5
Formula: C₉H₁₄N₄O₃
MW: 226.23 g/mol

VQ-032169

Reference Standard

4-[2-(5-Ethyl-2-pyridinyl)ethoxy]benzenemethanol chemical structure

4-[2-(5-Ethyl-2-pyridinyl)ethoxy]benzenemethanol

CAS: 144842-17-1
Formula: C₁₆H₁₉NO₂
MW: 257.33 g/mol

VQ-033198

Reference Standard

4-[2-(Diethylamino)ethoxy]benzophenone chemical structure

4-[2-(Diethylamino)ethoxy]benzophenone

CAS: 796-77-0
Formula: C₁₉H₂₃NO₂
MW: 297.4 g/mol

VQ-021195

Reference Standard

4-[2-(Dipropylamino)ethyl]-1-hydroxy-1,3-dihydro-2H-indol-2-one chemical structure

4-[2-(Dipropylamino)ethyl]-1-hydroxy-1,3-dihydro-2H-indol-2-one

CAS: 954117-22-7
Formula: C₁₆H₂₄N₂O₂
MW: 276.37 g/mol

VQ-033640

Reference Standard

4-[4-(3-Aminopropylamino)phenyl]morpholin-3-one chemical structure

4-[4-(3-Aminopropylamino)phenyl]morpholin-3-one

CAS: 1816946-19-6
Formula: C₁₃H₁₉N₃O₂
MW: 249.31 g/mol

VQ-045368

Reference Standard

4-[4-(4-Nitrophenyl)-1-piperazinyl]phenol chemical structure

4-[4-(4-Nitrophenyl)-1-piperazinyl]phenol

CAS: 112559-81-6
Formula: C₁₆H₁₇N₃O₃
MW: 299.32 g/mol

VQ-041566

Reference Standard

4-[4-(4-Trifluoromethoxyphenoxy)piperidin-1-yl]phenol chemical structure

4-[4-(4-Trifluoromethoxyphenoxy)piperidin-1-yl]phenol

CAS: 681482-81-5
Formula: C₁₈H₁₈F₃NO₃
MW: 353.3 g/mol

VQ-030114

Reference Standard

4-[4-(DiMethylaMino)-1-(4-fluorophenyl)-1-hydroxybutyl]-3-(hydroxyMethyl)-benzonitrile, oxalate chemical structure

4-[4-(DiMethylaMino)-1-(4-fluorophenyl)-1-hydroxybutyl]-3-(hydroxyMethyl)-benzonitrile, oxalate

CAS: 717133-32-9
Formula: C₂₂H₂₅FN₂O₆
MW: 432.4 g/mol

VQ-048267

Reference Standard

4-[4-(Dimethylamino)-1-oxobutyl]-3-(hydroxymethyl)benzonitrile chemical structure

4-[4-(Dimethylamino)-1-oxobutyl]-3-(hydroxymethyl)benzonitrile

CAS: 1433278-33-1
Formula: C₁₄H₁₈N₂O₂
MW: 246.3 g/mol

VQ-029830

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