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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.

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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-Amino-1-((2S,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)pyrimidin-2(1H)-one chemical structure

4-Amino-1-((2S,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)pyrimidin-2(1H)-one

CAS: 13913-16-1
Formula: C₉H₁₃N₃O₅
MW: 243.22 g/mol

VQ-025138

Reference Standard

4-Amino-1-((3aR,4R,6R,6aR)-6-(hydroxymethyl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)pyrimidin-2(1H)-one sulfate chemical structure

4-Amino-1-((3aR,4R,6R,6aR)-6-(hydroxymethyl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)pyrimidin-2(1H)-one sulfate

CAS: 1955522-00-5
Formula: C₁₂H₁₉N₃O₉S
MW: 381.36 g/mol

VQ-031971

Reference Standard

4-Amino-1-(3,5-di-O-acetyl-2-deoxy-D-erythro-pentofuranosyl)-1,3,5-triazin-2(1H)-one chemical structure

4-Amino-1-(3,5-di-O-acetyl-2-deoxy-D-erythro-pentofuranosyl)-1,3,5-triazin-2(1H)-one

CAS: 22432-93-5
Formula: C₁₂H₁₆N₄O₆
MW: 312.28 g/mol

VQ-036595

Reference Standard

4-Amino-1-(4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-1,3,5-triazin-2(1H)-on

4-Amino-1-(4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-1,3,5-triazin-2(1H)-on

CAS: 1072087-07-0
Formula: C₈H₁₂N₄O₄
MW: 228.21 g/mol

VQ-047975

Reference Standard

4-Amino-1-benzyl-piperidine-4-carboxylic acid chemical structure

4-Amino-1-benzyl-piperidine-4-carboxylic acid

CAS: 39143-25-4
Formula: C₁₃H₁₈N₂O₂
MW: 234.29 g/mol

VQ-021979

Reference Standard

4-Amino-1-methyl-3-(2-methylpropyl)-1H-pyrazole-5-carboxamide chemical structure

4-Amino-1-methyl-3-(2-methylpropyl)-1H-pyrazole-5-carboxamide

CAS: 268204-00-8
Formula: C₉H₁₆N₄O
MW: 196.25 g/mol

VQ-042164

Reference Standard

4-Amino-1-methyl-3-propyl-1H-pyrazole-5-carboxamide Hydrochloride chemical structure

4-Amino-1-methyl-3-propyl-1H-pyrazole-5-carboxamide Hydrochloride

CAS: 247584-10-7
Formula: C₈H₁₅ClN₄O
MW: 218.68 g/mol

VQ-033837

Reference Standard

4-Amino-1-methyl-5-propyl-1H-pyrazole-3-carboxamide chemical structure

4-Amino-1-methyl-5-propyl-1H-pyrazole-3-carboxamide

CAS: 247583-78-4
Formula: C₈H₁₄N₄O
MW: 182.22 g/mol

VQ-043296

Reference Standard

4-Amino-1,3-dimethyl-5-nitrosouracil chemical structure

4-Amino-1,3-dimethyl-5-nitrosouracil

CAS: 6632-68-4
Formula: C₆H₈N₄O₃
MW: 184.15 g/mol

VQ-036079

Reference Standard

4-Amino-2-(1-(3-ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethyl)isoindoline-1,3-dione chemical structure

4-Amino-2-(1-(3-ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethyl)isoindoline-1,3-dione

CAS: 253168-83-1
Formula: C₂₀H₂₂N₂O₆S
MW: 418.5 g/mol

VQ-024335

Reference Standard

4-Amino-2-(2,6-dioxopiperidin-3-yl)-5,6,7-trihydroxyisoindoline-1,3-dione chemical structure

4-Amino-2-(2,6-dioxopiperidin-3-yl)-5,6,7-trihydroxyisoindoline-1,3-dione

CAS: 1795373-44-2
Formula: C₁₃H₁₁N₃O₇
MW: 321.24 g/mol

VQ-043263

Reference Standard

4-Amino-2-chloro-5-fluoropyrimidine chemical structure

4-Amino-2-chloro-5-fluoropyrimidine

CAS: 155-10-2
Formula: C₄H₃ClFN₃
MW: 147.54 g/mol

VQ-030776

Reference Standard

4-Amino-2-chlorobenzene sulfonamide chemical structure

4-Amino-2-chlorobenzene sulfonamide

CAS: 1954-94-5
Formula: C₆H₇ClN₂O₂S
MW: 206.65 g/mol

VQ-031078

Reference Standard

4-Amino-2-ethoxy-3-nitrobenzoic Acid chemical structure

4-Amino-2-ethoxy-3-nitrobenzoic Acid

CAS: 2384085-43-0
Formula: C₉H₁₀N₂O₅
MW: 226.19 g/mol

VQ-022189

Reference Standard

4-Amino-2-ethoxy-3,5-dinitrobenzoic Acid

4-Amino-2-ethoxy-3,5-dinitrobenzoic Acid

CAS: 1884298-45-6
Formula: C₉H₉N₃O₇
MW: 271.18 g/mol

VQ-024990

Reference Standard

4-Amino-2-fluoro-N,N-dimethylbenzamide chemical structure

4-Amino-2-fluoro-N,N-dimethylbenzamide

CAS: 1187368-67-7
Formula: C₉H₁₁FN₂O
MW: 182.19 g/mol

VQ-039189

Reference Standard

4-Amino-2-fluorobenzoic Acid chemical structure

4-Amino-2-fluorobenzoic Acid

CAS: 446-31-1
Formula: C₇H₆FNO₂
MW: 155.13 g/mol

VQ-037010

Reference Standard

4-Amino-2-fluorophenol chemical structure

4-Amino-2-fluorophenol

CAS: 399-96-2
Formula: C₆H₆FNO
MW: 127.12 g/mol

VQ-034993

Reference Standard

4-Amino-2-hydroxy-5-hydroxymethylpyrimidine chemical structure

4-Amino-2-hydroxy-5-hydroxymethylpyrimidine

CAS: 1123-95-1
Formula: C₅H₇N₃O₂
MW: 141.13 g/mol

VQ-050108

Reference Standard

4-Amino-2-hydroxy-5-nitro-N-4-piperidinyl-benzamide Hybromide chemical structure

4-Amino-2-hydroxy-5-nitro-N-4-piperidinyl-benzamide Hybromide

CAS: 1797008-81-1
Formula: C₁₂H₁₇BrN₄O₄
MW: 361.19 g/mol

VQ-029817

Reference Standard

4-Amino-2-hydroxyacetophenone chemical structure

4-Amino-2-hydroxyacetophenone

CAS: 2476-29-1
Formula: C₈H₉NO₂
MW: 151.16 g/mol

VQ-051404

Reference Standard

4-Amino-2-hydroxybenzaldehyde chemical structure

4-Amino-2-hydroxybenzaldehyde

CAS: 52924-20-6
Formula: C₇H₇NO₂
MW: 137.14 g/mol

VQ-040017

Reference Standard

4-Amino-2-phenylphenol chemical structure

4-Amino-2-phenylphenol

CAS: 19434-42-5
Formula: C₁₂H₁₁NO
MW: 185.22 g/mol

VQ-039587

Reference Standard

4-Amino-2,3-dichlorophenol chemical structure

4-Amino-2,3-dichlorophenol

CAS: 39183-17-0
Formula: C₆H₅Cl₂NO
MW: 178.01 g/mol

VQ-048834

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