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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.

27,990products

6sub-categories

2,746in stock

COA + SDSwith every lot

API Impurities 14,098 Pharmacopeial Impurities (EP / USP / BP) 4,399 Nitrosamine Impurities 631 Stable Isotope Labelled Standards (Deuterated, 13C, 15N) 1,504 Metabolites & Degradation Products 3,922 API Reference Standards 3,436

Reference Standard

(2R,3R)-2-(2,4-Difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butane-2,3-diol chemical structure

(2R,3R)-2-(2,4-Difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butane-2,3-diol

CAS: 133775-25-4
Formula: C₁₂H₁₃F₂N₃O₂
MW: 269.25 g/mol

VQ-025495

Reference Standard

(2R,3R)-2-(2,4-Difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butane-2,3-diol Mesylate chemical structure

(2R,3R)-2-(2,4-Difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butane-2,3-diol Mesylate

CAS: 1175536-50-1
Formula: C₁₃H₁₇F₂N₃O₅S
MW: 365.36 g/mol

VQ-025493

Reference Standard

(2R,3R)-2-(2,4-Difluorophenyl)-1-(4H-1,2,4-triazol-4-yl)butane-2,3-diol chemical structure

(2R,3R)-2-(2,4-Difluorophenyl)-1-(4H-1,2,4-triazol-4-yl)butane-2,3-diol

CAS: 2122222-14-2
Formula: C₁₂H₁₃F₂N₃O₂
MW: 269.25 g/mol

VQ-030402

Reference Standard

(2R,3R)-2-(2,4-Difluorophenyl)-3-(3-methylenepiperidin-1-yl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol chemical structure

(2R,3R)-2-(2,4-Difluorophenyl)-3-(3-methylenepiperidin-1-yl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol

CAS: 164650-54-8
Formula: C₁₈H₂₂F₂N₄O
MW: 348.4 g/mol

VQ-036903

Reference Standard

(2R,3R)-2-(2,4-Difluorophenyl)-3-(5-fluoropyrimidin-4-yl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol chemical structure

(2R,3R)-2-(2,4-Difluorophenyl)-3-(5-fluoropyrimidin-4-yl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol

CAS: 239807-03-5
Formula: C₁₆H₁₄F₃N₅O
MW: 349.31 g/mol

VQ-044260

Reference Standard

(2R,3R)-2-(2,4-Difluorophenyl)-3-methyl-2-[(1H-1,2,4-triazol-1-yl)methyl]oxirane chemical structure

(2R,3R)-2-(2,4-Difluorophenyl)-3-methyl-2-[(1H-1,2,4-triazol-1-yl)methyl]oxirane

CAS: 135270-13-2
Formula: C₁₂H₁₁F₂N₃O
MW: 251.23 g/mol

VQ-025488

Reference Standard

(2R,3R)-2-(2,5-Difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)-2,3-butanediol chemical structure

(2R,3R)-2-(2,5-Difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)-2,3-butanediol

CAS: 241479-72-1
Formula: C₁₂H₁₃F₂N₃O₂
MW: 269.25 g/mol

VQ-035147

Reference Standard

(2R,3R)-2-(4-Fluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butane-2,3-diol

(2R,3R)-2-(4-Fluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butane-2,3-diol

CAS: 150803-08-0
Formula: C₁₂H₁₄FN₃O₂
MW: 251.26 g/mol

VQ-036906

Reference Standard

(2R,3R)-2-(4-Fluorophenyl)-3-(4-methylenepiperidin-1-yl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol chemical structure

(2R,3R)-2-(4-Fluorophenyl)-3-(4-methylenepiperidin-1-yl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol

CAS: 2055038-64-5
Formula: C₁₈H₂₃FN₄O
MW: 330.4 g/mol

VQ-036907

Reference Standard

(2R,3R)-2-(Benzoyloxy)-3-((4-Methylbenzoyl)Oxy)Succinic Acid chemical structure

(2R,3R)-2-(Benzoyloxy)-3-((4-Methylbenzoyl)Oxy)Succinic Acid

CAS: 1207512-32-0
Formula: C₁₉H₁₆O₈
MW: 372.3 g/mol

VQ-041829

Reference Standard

(2R,3R)-2-(Benzoyloxy)-3-hydroxysuccinic acid chemical structure

(2R,3R)-2-(Benzoyloxy)-3-hydroxysuccinic acid

CAS: 87172-82-5
Formula: C₁₁H₁₀O₇
MW: 254.19 g/mol

VQ-041830

Reference Standard

(2R,3R)-2-Amino-3-(3,4-dihydroxyphenyl)-3-hydroxypropanoic acid chemical structure

(2R,3R)-2-Amino-3-(3,4-dihydroxyphenyl)-3-hydroxypropanoic acid

CAS: 51829-98-2
Formula: C₉H₁₁NO₅
MW: 213.19 g/mol

VQ-030329

Reference Standard

(2R,3R)-2-Benzhydryl-N-(5-(tert-butyl)-2-methoxybenzyl)quinuclidin-3-amine chemical structure

(2R,3R)-2-Benzhydryl-N-(5-(tert-butyl)-2-methoxybenzyl)quinuclidin-3-amine

CAS: 2243127-12-8
Formula: C₃₂H₄₀N₂O
MW: 468.7 g/mol

VQ-035250

Reference Standard

(2R,3R)-2,3,4,6,7-Pentamethyl-2-(4,8,12-trimethyltridecyl)-2,3-dihydrobenzofuran-5-yl Acetate chemical structure

(2R,3R)-2,3,4,6,7-Pentamethyl-2-(4,8,12-trimethyltridecyl)-2,3-dihydrobenzofuran-5-yl Acetate

CAS: 1560716-40-6
Formula: C₃₁H₅₂O₃
MW: 472.7 g/mol

VQ-034667

Reference Standard

(2R,3R)-3-((1H-1,2,4-Triazol-1-yl)methyl)-6-fluoro-3-hydroxy-2-methyl-4'-methylenespiro[indoline-1,1'-piperidin]-1-ium Fluoride chemical structure

(2R,3R)-3-((1H-1,2,4-Triazol-1-yl)methyl)-6-fluoro-3-hydroxy-2-methyl-4'-methylenespiro[indoline-1,1'-piperidin]-1-ium Fluoride

CAS: 2252350-11-9
Formula: C₁₈H₂₂F₂N₄O
MW: 348.4 g/mol

VQ-036909

Reference Standard

(2R,3R)-3-(2,4-Difluorophenyl)-3-hydroxy-4-(1H-1,2,4-triazol-1-yl)butan-2-yl methanesulfonate chemical structure

(2R,3R)-3-(2,4-Difluorophenyl)-3-hydroxy-4-(1H-1,2,4-triazol-1-yl)butan-2-yl methanesulfonate

CAS: 133775-26-5
Formula: C₁₃H₁₅F₂N₃O₄S
MW: 347.34 g/mol

VQ-030403

Reference Standard

(2R,3R)-3-(2,5-Difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanamide chemical structure

(2R,3R)-3-(2,5-Difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanamide

CAS: 241479-75-4
Formula: C₁₃H₁₄F₂N₄O₂
MW: 296.27 g/mol

VQ-036908

Reference Standard

(2R,3R)-3-(2,5-Difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanenitrile chemical structure

(2R,3R)-3-(2,5-Difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanenitrile

CAS: 2001052-01-1
Formula: C₁₃H₁₂F₂N₄O
MW: 278.26 g/mol

VQ-026230

Reference Standard

(2R,3R)-3-(2,5-Difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)thiobutyramide chemical structure

(2R,3R)-3-(2,5-Difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)thiobutyramide

CAS: 368421-58-3
Formula: C₁₃H₁₄F₂N₄OS
MW: 312.34 g/mol

VQ-026228

Reference Standard

(2R,3R)-3-(4-Methylenepiperidin-1-yl)-2-phenyl-1-(1H-1,2,4-triazol-1-yl)butan-2-ol chemical structure

(2R,3R)-3-(4-Methylenepiperidin-1-yl)-2-phenyl-1-(1H-1,2,4-triazol-1-yl)butan-2-ol

CAS: 2055038-65-6
Formula: C₁₈H₂₄N₄O
MW: 312.4 g/mol

VQ-048153

Reference Standard

(2R,3R)-3-Hydroxy-2-(4-methoxy-3-methylphenyl)-2,3-dihydrobenzo[b][1,4]thiazepin-4(5H)-one chemical structure

(2R,3R)-3-Hydroxy-2-(4-methoxy-3-methylphenyl)-2,3-dihydrobenzo[b][1,4]thiazepin-4(5H)-one

CAS: 42399-51-9
Formula: C₁₆H₁₅NO₃S
MW: 301.4 g/mol

VQ-036707

Reference Standard

(2R,3R)-4-((4-Chlorophenyl)amino)-2,3-dihydroxy-4-oxobutanoic acid chemical structure

(2R,3R)-4-((4-Chlorophenyl)amino)-2,3-dihydroxy-4-oxobutanoic acid

CAS: 17447-35-7
Formula: C₁₀H₁₀ClNO₅
MW: 259.64 g/mol

VQ-048603

Reference Standard

(2R,3R)-4,4-Difluoro-2-(hydroxymethyl)-5-oxotetrahydrofuran-3-yl Benzoate chemical structure

(2R,3R)-4,4-Difluoro-2-(hydroxymethyl)-5-oxotetrahydrofuran-3-yl Benzoate

CAS: 122111-07-3
Formula: C₁₂H₁₀F₂O₅
MW: 272.2 g/mol

VQ-037500

Reference Standard

(2R,3S,11BR)-Dihydrotetrabenazine chemical structure

(2R,3S,11BR)-Dihydrotetrabenazine

CAS: 862377-31-9
Formula: C₁₉H₂₉NO₃
MW: 319.4 g/mol

VQ-034170

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