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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-(Methoxycarbonyl)benzoic acid chemical structure

4-(Methoxycarbonyl)benzoic acid

CAS: 1679-64-7
Formula: C₉H₈O₄
MW: 180.16 g/mol

VQ-024575

Reference Standard

4-(Methyl(nitroso)amino)-3-nitrobenzoic Acid chemical structure

4-(Methyl(nitroso)amino)-3-nitrobenzoic Acid

Formula: C₈H₇N₃O₅
MW: 225.16 g/mol

In stock

Reference Standard

4-(Methyl(nitroso)amino)benzoic Acid chemical structure

4-(Methyl(nitroso)amino)benzoic Acid

CAS: 5757-76-6
Formula: C₈H₈N₂O₃
MW: 180.16 g/mol

VQ-027267

Reference Standard

4-(Methylamino)-1-(3-pyridyl)-1-butanone Dihydrochloride chemical structure

4-(Methylamino)-1-(3-pyridyl)-1-butanone Dihydrochloride

CAS: 66093-90-1
Formula: C₁₀H₁₆Cl₂N₂O
MW: 251.15 g/mol

VQ-032144

Reference Standard

4-(Methylamino)-3-nitrobenzamide chemical structure

4-(Methylamino)-3-nitrobenzamide

CAS: 41263-66-5
Formula: C₈H₉N₃O₃
MW: 195.18 g/mol

VQ-040547

Reference Standard

4-(Methylamino)benzoic acid chemical structure

4-(Methylamino)benzoic acid

CAS: 10541-83-0
Formula: C₈H₉NO₂
MW: 151.16 g/mol

VQ-038359

Reference Standard

4-(Methylnitrosamino)-1-(3-pyridyl-d4)-1-butanone chemical structure

4-(Methylnitrosamino)-1-(3-pyridyl-d4)-1-butanone

CAS: 764661-24-7
Formula: C₁₀H₁₃N₃O₂
MW: 211.25 g/mol

VQ-041198

Reference Standard

4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone chemical structure

4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone

CAS: 64091-91-4
Formula: C₁₀H₁₃N₃O₂
MW: 207.23 g/mol

VQ-032312

Reference Standard

4-(Methylsulfonyl)Aniline chemical structure

4-(Methylsulfonyl)Aniline

CAS: 5470-49-5
Formula: C₇H₉NO₂S
MW: 171.22 g/mol

VQ-032885

Reference Standard

4-(Methylthio)-2-(nitrosoamino)butanoic acid

4-(Methylthio)-2-(nitrosoamino)butanoic acid

CAS: 1378684-66-2
Formula: C₅H₁₀N₂O₃S
MW: 178.21 g/mol

VQ-048243

Reference Standard

4-(N,N-Dimethylamino)butanal Dimethyl Acetal chemical structure

4-(N,N-Dimethylamino)butanal Dimethyl Acetal

CAS: 19718-92-4
Formula: C₈H₁₉NO₂
MW: 161.24 g/mol

VQ-032479

Reference Standard

4-(N,N-Dimethylsulfamoyl)benzoic acid chemical structure

4-(N,N-Dimethylsulfamoyl)benzoic acid

CAS: 1206-37-7
Formula: C₉H₁₁NO₄S
MW: 229.26 g/mol

VQ-043617

Reference Standard

4-(Nitrooxy)butyl (E)-7-((1R,2R,3R,5S)-3,5-dihydroxy-2-((R)-3-hydroxy-5-phenylpentyl)cyclopentyl)hept-5-enoate chemical structure

4-(Nitrooxy)butyl (E)-7-((1R,2R,3R,5S)-3,5-dihydroxy-2-((R)-3-hydroxy-5-phenylpentyl)cyclopentyl)hept-5-enoate

CAS: 2099033-66-4
Formula: C₂₇H₄₁NO₈
MW: 507.6 g/mol

VQ-026380

Reference Standard

4-(Nitrooxy)butyl (Z)-7-((1R,2R,3R,5S)-3,5-dihydroxy-2-((S)-3-hydroxy-5-phenylpentyl)cyclopentyl)hept-5-enoate chemical structure

4-(Nitrooxy)butyl (Z)-7-((1R,2R,3R,5S)-3,5-dihydroxy-2-((S)-3-hydroxy-5-phenylpentyl)cyclopentyl)hept-5-enoate

CAS: 2099033-64-2
Formula: C₂₇H₄₁NO₈
MW: 507.6 g/mol

VQ-031455

Reference Standard

4-(Nitrosoamino)benzenesulfonamide chemical structure

4-(Nitrosoamino)benzenesulfonamide

CAS: 343853-74-7
Formula: C₆H₇N₃O₃S
MW: 201.21 g/mol

VQ-044909

Reference Standard

4-(Oxiran-2-ylmethoxy)-9-(oxiran-2-ylmethyl)-9H-carbazole chemical structure

4-(Oxiran-2-ylmethoxy)-9-(oxiran-2-ylmethyl)-9H-carbazole

CAS: 1198090-71-9
Formula: C₁₈H₁₇NO₃
MW: 295.3 g/mol

VQ-024820

Reference Standard

4-(p-Tolylamino)pyridine-3-sulfonamide chemical structure

4-(p-Tolylamino)pyridine-3-sulfonamide

CAS: 164595-81-7
Formula: C₁₂H₁₃N₃O₂S
MW: 263.32 g/mol

VQ-028468

Reference Standard

4-(Phenylsulfonyl)benzene-1,3-diamine chemical structure

4-(Phenylsulfonyl)benzene-1,3-diamine

CAS: 116435-84-8
Formula: C₁₂H₁₂N₂O₂S
MW: 248.3 g/mol

VQ-036544

Reference Standard

4-(Propylthio)benzene-1,2-diamine chemical structure

4-(Propylthio)benzene-1,2-diamine

CAS: 66608-52-4
Formula: C₉H₁₄N₂S
MW: 182.29 g/mol

VQ-021472

Reference Standard

4-(Pyrrolidino Sulfonyl Methyl) phenyl Hydrazine Hydrochloride chemical structure

4-(Pyrrolidino Sulfonyl Methyl) phenyl Hydrazine Hydrochloride

CAS: 334981-11-2
Formula: C₁₁H₁₈ClN₃O₂S
MW: 291.8 g/mol

VQ-021502

Reference Standard

4-(tert-Butyl) 1-ethyl 2-propylsuccinate chemical structure

4-(tert-Butyl) 1-ethyl 2-propylsuccinate

CAS: 1997309-39-3
Formula: C₁₃H₂₄O₄
MW: 244.33 g/mol

VQ-029513

Reference Standard

4-(tert-Butyl)-N-((4-(tert-Butyl)phenyl)sulfonyl)benzenesulfonamide chemical structure

4-(tert-Butyl)-N-((4-(tert-Butyl)phenyl)sulfonyl)benzenesulfonamide

CAS: 1355251-10-3
Formula: C₂₀H₂₇NO₄S₂
MW: 409.6 g/mol

VQ-029476

Reference Standard

4-(tert-Butyl)-N-(5-(2-methoxyphenoxy)-6-(vinyloxy)-[2,2'-bipyrimidin]-4-yl)benzenesulfonamide chemical structure

4-(tert-Butyl)-N-(5-(2-methoxyphenoxy)-6-(vinyloxy)-[2,2'-bipyrimidin]-4-yl)benzenesulfonamide

CAS: 1257099-44-7
Formula: C₂₇H₂₇N₅O₅S
MW: 533.6 g/mol

VQ-024621

Reference Standard

4-(Tert-Butyl)-N-(5-hydroxy-6-(2-(2-hydroxyethoxy)ethoxy)-[2,2'-bipyrimidin]-4-yl)benzenesulfonamide chemical structure

4-(Tert-Butyl)-N-(5-hydroxy-6-(2-(2-hydroxyethoxy)ethoxy)-[2,2'-bipyrimidin]-4-yl)benzenesulfonamide

CAS: 1257099-41-4
Formula: C₂₂H₂₇N₅O₆S
MW: 489.5 g/mol

VQ-036008

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