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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-(1-(2,4-Diaminopteridin-6-yl)pent-4-yn-2-yl)benzoic Acid chemical structure

4-(1-(2,4-Diaminopteridin-6-yl)pent-4-yn-2-yl)benzoic Acid

CAS: 146464-93-9
Formula: C₁₈H₁₆N₆O₂
MW: 348.4 g/mol

VQ-027563

Reference Standard

4-(1-Bromoethyl)-5-fluoropyrimidine chemical structure

4-(1-Bromoethyl)-5-fluoropyrimidine

CAS: 188416-47-9
Formula: C₆H₆BrFN₂
MW: 205.03 g/mol

VQ-042941

Reference Standard

4-(1-Carboxyethyl)-δ-oxo-benzenehexanoic Acid chemical structure

4-(1-Carboxyethyl)-δ-oxo-benzenehexanoic Acid

CAS: 1091621-61-2
Formula: C₁₅H₁₈O₅
MW: 278.3 g/mol

VQ-026530

Reference Standard

4-(1-Cyclohexyl-1H-tetrazol-5-yl)butan-1-ol chemical structure

4-(1-Cyclohexyl-1H-tetrazol-5-yl)butan-1-ol

CAS: 934533-78-5
Formula: C₁₁H₂₀N₄O
MW: 224.3 g/mol

VQ-028944

Reference Standard

4-(1-Hydroxy-1-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydronaphthalen-2-yl)ethyl)benzoic Acid chemical structure

4-(1-Hydroxy-1-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydronaphthalen-2-yl)ethyl)benzoic Acid

CAS: 852524-20-0
Formula: C₂₄H₃₀O₃
MW: 366.5 g/mol

VQ-044286

Reference Standard

4-(1-Hydroxy-2-(methylamino)ethyl)benzene-1,2-diol Sulfate chemical structure

4-(1-Hydroxy-2-(methylamino)ethyl)benzene-1,2-diol Sulfate

CAS: 1260664-57-0
Formula: C₉H₁₅NO₇S
MW: 281.29 g/mol

VQ-035622

Reference Standard

4-(1-Hydroxy-2-methylpropan-2-yl)benzoic Acid chemical structure

4-(1-Hydroxy-2-methylpropan-2-yl)benzoic Acid

CAS: 75492-21-6
Formula: C₁₁H₁₄O₃
MW: 194.23 g/mol

VQ-048370

Reference Standard

4-(1-Methoxy-1-methylethyl)-2-propyl-1H-imidazole-5-carboxylic Acid Ethyl Ester chemical structure

4-(1-Methoxy-1-methylethyl)-2-propyl-1H-imidazole-5-carboxylic Acid Ethyl Ester

CAS: 1092980-84-1
Formula: C₁₃H₂₂N₂O₃
MW: 254.33 g/mol

VQ-023328

Reference Standard

4-(1-Methoxy-2-(methylamino)ethyl)benzene-1,2-diol chemical structure

4-(1-Methoxy-2-(methylamino)ethyl)benzene-1,2-diol

CAS: 2947-02-6
Formula: C₁₀H₁₅NO₃
MW: 197.23 g/mol

VQ-024150

Reference Standard

4-(1-Methyl-1H-indol-3-yl)pyrimidin-2-amine chemical structure

4-(1-Methyl-1H-indol-3-yl)pyrimidin-2-amine

CAS: 199865-36-6
Formula: C₁₃H₁₂N₄
MW: 224.26 g/mol

VQ-049364

Reference Standard

4-(1-Methyl-4-piperidinyl)-4H-benzo[4,5]cyclohepta[1,2-b]thiophene-4-ol chemical structure

4-(1-Methyl-4-piperidinyl)-4H-benzo[4,5]cyclohepta[1,2-b]thiophene-4-ol

CAS: 4506-57-4
Formula: C₁₉H₂₁NOS
MW: 311.4 g/mol

VQ-037822

Reference Standard

4-(1-Methyl-5-nitro-1H-benzo[d]imidazol-2-yl)butanoic Acid chemical structure

4-(1-Methyl-5-nitro-1H-benzo[d]imidazol-2-yl)butanoic Acid

CAS: 31349-48-1
Formula: C₁₂H₁₃N₃O₄
MW: 263.25 g/mol

VQ-029381

Reference Standard

4-(1-Methylpyridin-1-ium-4-yl) thiazole-2-thiolate chemical structure

4-(1-Methylpyridin-1-ium-4-yl) thiazole-2-thiolate

CAS: 1427207-46-2
Formula: C₉H₈N₂S₂
MW: 208.3 g/mol

VQ-024870

Reference Standard

4-(1-Nitrosohydrazinyl)benzenesulfonamide chemical structure

4-(1-Nitrosohydrazinyl)benzenesulfonamide

CAS: 2860553-70-2
Formula: C₆H₈N₄O₃S
MW: 216.22 g/mol

VQ-044134

Reference Standard

4-(1-Nitrosopiperidin-4-yl)morpholine chemical structure

4-(1-Nitrosopiperidin-4-yl)morpholine

CAS: 2089333-06-0
Formula: C₉H₁₇N₃O₂
MW: 199.25 g/mol

VQ-032887

Reference Standard

4-(1,1-Dimethyl-2-oxo-1,2-dihydro-3H-benzo[e]indol-3-yl)butane-1-sulfonic Acid chemical structure

4-(1,1-Dimethyl-2-oxo-1,2-dihydro-3H-benzo[e]indol-3-yl)butane-1-sulfonic Acid

CAS: 906772-02-9
Formula: C₁₈H₂₁NO₄S
MW: 347.4 g/mol

VQ-031202

Reference Standard

4-(1,2,4-Oxadiazol-3-yl)aniline chemical structure

4-(1,2,4-Oxadiazol-3-yl)aniline

CAS: 59908-70-2
Formula: C₈H₇N₃O
MW: 161.16 g/mol

VQ-047377

Reference Standard

4-(1,3,2-Dioxaborinan-2-yl)benzonitrile chemical structure

4-(1,3,2-Dioxaborinan-2-yl)benzonitrile

CAS: 152846-62-3
Formula: C₁₀H₁₀BNO₂
MW: 187 g/mol

VQ-041408

Reference Standard

4-(1a,10b-Dihydro-6H-dibenzo[3,4:6,7]cyclohepta[1,2-b]oxiren-6-ylidene)-1-methylpiperidine chemical structure

4-(1a,10b-Dihydro-6H-dibenzo[3,4:6,7]cyclohepta[1,2-b]oxiren-6-ylidene)-1-methylpiperidine

CAS: 54191-04-7
Formula: C₂₁H₂₁NO
MW: 303.4 g/mol

VQ-035173

Reference Standard

4-(1H-1,2,4-Triazol-l-yl Methyl) Phenyl Hydrazine Dihydrochloride chemical structure

4-(1H-1,2,4-Triazol-l-yl Methyl) Phenyl Hydrazine Dihydrochloride

CAS: 212248-62-9
Formula: C₉H₁₂ClN₅
MW: 225.68 g/mol

VQ-027865

Reference Standard

4-(2-((2S,3R)-3-(2,5-Difluorophenyl)-3-hydroxy-4-(1H-1,2,4-triazol-1-yl)butan-2-yl)thiazol-4-yl)benzonitrile chemical structure

4-(2-((2S,3R)-3-(2,5-Difluorophenyl)-3-hydroxy-4-(1H-1,2,4-triazol-1-yl)butan-2-yl)thiazol-4-yl)benzonitrile

CAS: 1176988-44-5
Formula: C₂₂H₁₇F₂N₅OS
MW: 437.5 g/mol

VQ-026223

Reference Standard

4-(2-((4-(4-Methoxyphenyl)butan-2-yl)amino)ethyl)benzene-1,2-diol Hydrochloride chemical structure

4-(2-((4-(4-Methoxyphenyl)butan-2-yl)amino)ethyl)benzene-1,2-diol Hydrochloride

CAS: 82473-36-7
Formula: C₁₉H₂₆ClNO₃
MW: 351.9 g/mol

VQ-030243

Reference Standard

4-(2-((4-Acetamidophenyl)amino)pyrimidin-4-yl)-N-(cyanomethyl)benzamide chemical structure

4-(2-((4-Acetamidophenyl)amino)pyrimidin-4-yl)-N-(cyanomethyl)benzamide

CAS: 1841094-22-1
Formula: C₂₁H₁₈N₆O₂
MW: 386.4 g/mol

VQ-031975

Reference Standard

4-(2-((4-Morpholinophenyl)amino)pyrimidin-4-yl)benzoic Acid chemical structure

4-(2-((4-Morpholinophenyl)amino)pyrimidin-4-yl)benzoic Acid

CAS: 945749-71-3
Formula: C₂₁H₂₀N₄O₃
MW: 376.4 g/mol

VQ-026757

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