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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

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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-Methoxy-4-methyl-2-pentanone chemical structure

4-Methoxy-4-methyl-2-pentanone

CAS: 107-70-0
Formula: C₇H₁₄O₂
MW: 130.18 g/mol

VQ-032399

Reference Standard

4-Methoxy-5-(3-morpholinopropoxy)-2-nitrobenzonitrile chemical structure

4-Methoxy-5-(3-morpholinopropoxy)-2-nitrobenzonitrile

CAS: 675126-26-8
Formula: C₁₅H₁₉N₃O₅
MW: 321.33 g/mol

VQ-030956

Reference Standard

4-Methoxy-5-nitro-2-(propylthio)pyrimidine chemical structure

4-Methoxy-5-nitro-2-(propylthio)pyrimidine

CAS: 2514951-26-7
Formula: C₈H₁₁N₃O₃S
MW: 229.26 g/mol

VQ-028367

Reference Standard

4-Methoxy-d3-benzoic Acid chemical structure

4-Methoxy-d3-benzoic Acid

CAS: 27914-54-1
Formula: C₈H₈O₃
MW: 155.17 g/mol

VQ-052420

Reference Standard

4-Methoxybenzyl (6R,7R)-7-amino-3-(chloromethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate chemical structure

4-Methoxybenzyl (6R,7R)-7-amino-3-(chloromethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

CAS: 106773-36-8
Formula: C₁₆H₁₇ClN₂O₄S
MW: 368.8 g/mol

VQ-035053

Reference Standard

4-Methoxycinnamic Acid Ethyl Ester chemical structure

4-Methoxycinnamic Acid Ethyl Ester

CAS: 1929-30-2
Formula: C₁₂H₁₄O₃
MW: 206.24 g/mol

VQ-049810

Reference Standard

4-Methyl Hippuric Acid chemical structure

4-Methyl Hippuric Acid

CAS: 27115-50-0
Formula: C₁₀H₁₁NO₃
MW: 193.2 g/mol

VQ-039134

Reference Standard

4-Methyl Tapinarof Impurity chemical structure

4-Methyl Tapinarof Impurity

CAS: 2657659-60-2
Formula: C₁₈H₂₀O₂
MW: 268.3 g/mol

VQ-034044

Reference Standard

4-Methyl-1-cyclohexanecarboxylic acid chemical structure

4-Methyl-1-cyclohexanecarboxylic acid

CAS: 4331-54-8
Formula: C₈H₁₄O₂
MW: 142.2 g/mol

VQ-032587

Reference Standard

4-Methyl-1-phenylpyridin-2(1H)-one chemical structure

4-Methyl-1-phenylpyridin-2(1H)-one

CAS: 161057-93-8
Formula: C₁₂H₁₁NO
MW: 185.22 g/mol

VQ-043655

Reference Standard

4-Methyl-1H-imidazole Clotrimazole chemical structure

4-Methyl-1H-imidazole Clotrimazole

CAS: 289887-34-9
Formula: C₂₃H₁₉ClN₂
MW: 358.9 g/mol

VQ-045303

Reference Standard

4-Methyl-2-(1-methyl-5-(2-morpholino-2-oxoethyl)-1H-pyrrol-2-yl)benzaldehyde

4-Methyl-2-(1-methyl-5-(2-morpholino-2-oxoethyl)-1H-pyrrol-2-yl)benzaldehyde

CAS: 2514774-68-4
Formula: C₁₉H₂₂N₂O₃
MW: 326.4 g/mol

VQ-034323

Reference Standard

4-Methyl-2-propyl-1H-benzimidazole-6-carboxylic Acid Methyl Ester chemical structure

4-Methyl-2-propyl-1H-benzimidazole-6-carboxylic Acid Methyl Ester

CAS: 152628-00-7
Formula: C₁₃H₁₆N₂O₂
MW: 232.28 g/mol

VQ-032658

Reference Standard

4-Methyl-3-((4-(pyridin-3-yl)pyrimidin-2-yl)amino)benzamide chemical structure

4-Methyl-3-((4-(pyridin-3-yl)pyrimidin-2-yl)amino)benzamide

CAS: 851137-91-2
Formula: C₁₇H₁₅N₅O
MW: 305.33 g/mol

VQ-032155

Reference Standard

4-Methyl-3-oxo-N-phenyl pentanamide chemical structure

4-Methyl-3-oxo-N-phenyl pentanamide

CAS: 124401-38-3
Formula: C₁₂H₁₅NO₂
MW: 205.25 g/mol

VQ-021667

Reference Standard

4-Methyl-3-oxo-N-phenyl-2- (phenylmethylene) pentanamide chemical structure

4-Methyl-3-oxo-N-phenyl-2- (phenylmethylene) pentanamide

CAS: 125971-57-5
Formula: C₁₉H₁₉NO₂
MW: 293.4 g/mol

VQ-029261

Reference Standard

4-Methyl-4-(methylnitrosoamino)-2-pentanone chemical structure

4-Methyl-4-(methylnitrosoamino)-2-pentanone

CAS: 16339-21-2
Formula: C₇H₁₄N₂O₂
MW: 158.2 g/mol

VQ-034535

Reference Standard

4-Methyl-5-(2-(1,1,1-trifluoro-2-methylpropan-2-yl)pyridin-4-yl)thiazol-2-amine chemical structure

4-Methyl-5-(2-(1,1,1-trifluoro-2-methylpropan-2-yl)pyridin-4-yl)thiazol-2-amine

CAS: 1357476-69-7
Formula: C₁₃H₁₄F₃N₃S
MW: 301.33 g/mol

VQ-045096

Reference Standard

4-Methyl-5-thiazoleethanol chemical structure

4-Methyl-5-thiazoleethanol

CAS: 137-00-8
Formula: C₆H₉NOS
MW: 143.21 g/mol

VQ-023357

Reference Standard

4-Methyl-N-(3-(2-methyl-1H-imidazol-1-yl)-5-(trifluoromethyl)phenyl)-3-((4-(pyridin-3-yl)pyrimidin-2-yl)amino)benzamide chemical structure

4-Methyl-N-(3-(2-methyl-1H-imidazol-1-yl)-5-(trifluoromethyl)phenyl)-3-((4-(pyridin-3-yl)pyrimidin-2-yl)amino)benzamide

CAS: 641571-05-3
Formula: C₂₈H₂₂F₃N₇O
MW: 529.5 g/mol

VQ-032159

Reference Standard

4-Methyl-N-(3-(4-methyl-1H-imidazol-1-yl)-5-(trifluoromethyl)phenyl)-3-nitrobenzamide chemical structure

4-Methyl-N-(3-(4-methyl-1H-imidazol-1-yl)-5-(trifluoromethyl)phenyl)-3-nitrobenzamide

CAS: 1157857-29-8
Formula: C₁₉H₁₅F₃N₄O₃
MW: 404.3 g/mol

VQ-035209

Reference Standard

4-Methyl-N-(4-methyl-3-((4-(pyridin-3-yl)pyrimidin-2-yl)amino)phenyl)benzamide chemical structure

4-Methyl-N-(4-methyl-3-((4-(pyridin-3-yl)pyrimidin-2-yl)amino)phenyl)benzamide

CAS: 152459-96-6
Formula: C₂₄H₂₁N₅O
MW: 395.5 g/mol

VQ-026141

Reference Standard

4-Methylacetophenone Phenylhydrazone chemical structure

4-Methylacetophenone Phenylhydrazone

CAS: 54779-81-6
Formula: C₁₅H₁₆N₂
MW: 224.3 g/mol

VQ-036216

Reference Standard

4-Methylamino-d3 Antipyrine chemical structure

4-Methylamino-d3 Antipyrine

CAS: 1246820-06-3
Formula: C₁₂H₁₅N₃O
MW: 220.29 g/mol

VQ-031811

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