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Impurity Reference Standards

Pharmacopoeial impurities, nitrosamines, metabolites, labelled internal standards and API working standards, each backed by analytical data for method development and QC.

20,060 products6 categories2,050 in stockCOA + SDS with every lot

20,060 products · page 169 of 836

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4-[2-(4-Nitro-1H-imidazol-1-yl)ethyl]morpholine

CAS: 6497-78-5
Formula: C₉H₁₄N₄O₃
MW: 226.23 g/mol

ZX-030865

4-[2-(5-Ethyl-2-pyridinyl)ethoxy]benzenemethanol

CAS: 144842-17-1
Formula: C₁₆H₁₉NO₂
MW: 257.33 g/mol

ZX-031868

4-[2-(Diethylamino)ethoxy]benzophenone

CAS: 796-77-0
Formula: C₁₉H₂₃NO₂
MW: 297.4 g/mol

ZX-020250

4-[2-(Dipropylamino)ethyl]-1-hydroxy-1,3-dihydro-2H-indol-2-one

CAS: 954117-22-7
Formula: C₁₆H₂₄N₂O₂
MW: 276.37 g/mol

ZX-032282

4-[2-Hydroxy-3-(isopropylamino)propoxy]benzoic acid hydrochloride

CAS: 33948-04-8
Formula: C₁₃H₂₀ClNO₄
MW: 289.75 g/mol

ZX-044545

4-[4-(4-Trifluoromethoxyphenoxy)piperidin-1-yl]phenol

CAS: 681482-81-5
Formula: C₁₈H₁₈F₃NO₃
MW: 353.3 g/mol

ZX-028908

4-[4-(Dimethylamino)-1-oxobutyl]-3-(hydroxymethyl)benzonitrile

CAS: 1433278-33-1
Formula: C₁₄H₁₈N₂O₂
MW: 246.3 g/mol

ZX-028643

4-[4-(Trifluoromethoxy)phenoxy]piperidine

CAS: 287952-67-4
Formula: C₁₂H₁₄F₃NO₂
MW: 261.24 g/mol

ZX-024208

4-[8-Amino-3-(3,4-dihydro-2H-pyrrol-5-yl)imidazo[1,5-a]pyrazin-1-yl]-N-2-pyridinylbenzamide

CAS: 2230757-49-8
Formula: C₂₂H₁₉N₇O
MW: 397.4 g/mol

ZX-020447

4-{(E)-[(2-Fluorophenyl)imino]methyl}phenol

CAS: 1829558-56-6
Formula: C₁₃H₁₀FNO
MW: 215.22 g/mol

ZX-029425

4-2R,3S,4S,5R)-3-(3,4-Difluoro- 2-hydroxyphenyl)tetrahydro- 4,5-dimethyl-5-(trifluoromethyl)- 2-furanyl]carbonyl]amino]-2- Pyridinecarboxamide

CAS: 2649467-91-2
Formula: C₂₀H₁₈F₅N₃O₄
MW: 459.4 g/mol

ZX-027059

4-Acetamido-2,2,6,6-tetramethylpiperidine

CAS: 40908-37-0
Formula: C₁₁H₂₂N₂O
MW: 198.31 g/mol

ZX-043796

4-Acetamidoantipyrine

CAS: 83-15-8
Formula: C₁₃H₁₅N₃O₂
MW: 245.28 g/mol

ZX-022107

4-Acetamidocyclohexanol

CAS: 23363-88-4
Formula: C₈H₁₅NO₂
MW: 157.21 g/mol

ZX-031628

4-Acetamidophenyl beta-D-Glucuronide Sodium Salt

CAS: 120595-80-4
Formula: C₁₄H₁₆NNaO₈
MW: 349.27 g/mol

ZX-031730

4-Acetamidophenyl beta-D-Glucuronide-D3 Sodium Salt

CAS: 1260619-61-1
Formula: C₁₄H₁₆NNaO₈
MW: 352.29 g/mol

ZX-035934

4-Acetaminophen Sulfate Potassium Salt

CAS: 32113-41-0
Formula: C₈H₈KNO₅S
MW: 269.32 g/mol

ZX-031731

4-Acetyl-2-propyl-1H-imidazole-5-carboxylic Acid Ethyl Ester

CAS: 144690-07-3
Formula: C₁₁H₁₆N₂O₃
MW: 224.26 g/mol

ZX-030923

4-Acetyl-2,6-di-tert-butylphenol

CAS: 14035-33-7
Formula: C₁₆H₂₄O₂
MW: 248.36 g/mol

ZX-035354

4-Amino -1-(4-nitrobenzyl)-1,2,4-triazolium bromide

CAS: 6085-99-0
Formula: C₉H₁₀BrN₅O₂
MW: 300.11 g/mol

ZX-031276

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

CAS: 157771-77-2
Formula: C₈H₁₂N₄O₅
MW: 244.2 g/mol

ZX-020739

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

ZX-024106

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

ZX-030678

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

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

ZX-021015

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