Impurity Reference Standards

API Impurities

Process impurities, isomers, degradants and related compounds for thousands of APIs, characterised for method development, validation and QC release.

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2-(3,5-Dichloro-4-((5-isopropyl-6-oxo-1,6-dihydropyridazin-3-yl)oxy)phenyl)-3,5-dioxo-2,3,4,5-tetrahydro-1,2,4-triazine-6-carboxylic Acid

CAS: 920509-35-9
Formula: C₁₇H₁₃Cl₂N₅O₆
MW: 454.2 g/mol

ZX-020384

2-(3,5-Dichlorophenyl)-1,3-benzoxazole-6-carboxylic Acid (2R,3R,4R,5S)-6-(methylamino)hexane-1,2,3,4,5-pentol

CAS: 827022-35-5
Formula: C₃₃H₄₅N₇O₄
MW: 603.8 g/mol

ZX-031708

2-(4-(((2-Cyanoethyl)thio)methyl)thiazol-2-yl)guanidine

CAS: 76823-93-3
Formula: C₈H₁₁N₅S₂
MW: 241.3 g/mol

ZX-029440

2-(4-((Methylamino)methyl)thiazol-2-yl)propan-2-ol

CAS: 1051463-24-1
Formula: C₈H₁₄N₂OS
MW: 186.28 g/mol

ZX-028726

2-(4-(2-(4-(1-(2-Ethoxyethyl)-1H-benzo[d]imidazol-2-yl)piperidin-1-yl)ethyl)phenyl)-N-methoxy-N,2-dimethylpropanamide

CAS: 1638785-18-8
Formula: C₃₀H₄₂N₄O₃
MW: 506.7 g/mol

ZX-028268

2-(4-(2-(4-(1-(2-Methoxyethyl)-1H-benzo[d]imidazol-2-yl)piperidin-1-yl)ethyl)phenyl)-2-methylpropanoic Acid

CAS: 2767508-98-3
Formula: C₂₇H₃₅N₃O₃
MW: 449.6 g/mol

ZX-020019

2-(4-(2-(4-(1-(4-(2-Carboxypropan-2-yl)phenethyl)-1H-benzo[d]imidazol-2-yl)piperidin-1-yl)ethyl)phenyl)-2-methylpropanoic Acid

CAS: 2411093-91-7
Formula: C₃₆H₄₃N₃O₄
MW: 581.7 g/mol

ZX-019741

2-(4-(2-(4-(1H-Benzo[d]imidazol-2-yl)piperidin-1-yl)ethyl)phenyl)-2-methylpropanoic Acid

CAS: 2099128-83-1
Formula: C₂₄H₂₉N₃O₂
MW: 391.5 g/mol

ZX-023577

2-(4-(2-(4,4-Dimethyl-4,5-dihydrooxazol-2-yl)propan-2-yl)phenyl)ethanol

CAS: 361382-26-5
Formula: C₁₆H₂₃NO₂
MW: 261.36 g/mol

ZX-028274

2-(4-(2-Chloroacetyl)phenyl)-N-methoxy-N,2-dimethylpropanamide

CAS: 1638785-15-5
Formula: C₁₄H₁₈ClNO₃
MW: 283.75 g/mol

ZX-028272

2-(4-(3-(2-(Trifluoromethyl)-10H-phenothiazin-10-yl)propyl)piperazin-1-yl)ethyl decanoate Hydrochloride

CAS: 1006061-35-3
Formula: C₃₂H₄₆Cl₂F₃N₃O₂S
MW: 664.7 g/mol

ZX-044176

2-(4-(3-(2-(Trifluoromethyl)-10H-phenothiazin-10-yl)propyl)piperazin-1-yl)ethyl stearate

CAS: 2285-19-0
Formula: C₄₀H₆₀F₃N₃O₂S
MW: 704 g/mol

ZX-029583

2-(4-(6-((5-((2-Chloro-6-methylphenyl)carbamoyl)thiazol-2-yl)amino)-2-methylpyrimidin-4-yl)piperazin-1-yl)ethyl acetate

CAS: 1245157-85-0
Formula: C₂₄H₂₈ClN₇O₃S
MW: 530 g/mol

ZX-024178

2-(4-(Benzo[d][1,3]dioxol-4-ylmethyl)piperazin-1-yl)pyrimidine

CAS: 1022849-90-6
Formula: C₁₆H₁₈N₄O₂
MW: 298.34 g/mol

ZX-031885

2-(4-(Chloromethyl)phenyl)propanoic Acid

CAS: 80530-55-8
Formula: C₁₀H₁₁ClO₂
MW: 198.64 g/mol

ZX-030390

2-(4-(Diethylamino)benzoyl)benzene-1,4-disulfonic Acid

CAS: 2828260-22-4
Formula: C₁₇H₁₉NO₇S₂
MW: 413.5 g/mol

ZX-030021

2-(4-(Tert-Butoxy)phenyl)ethanol

CAS: 123195-72-2
Formula: C₁₂H₁₈O₂
MW: 194.27 g/mol

ZX-025596

2-(4-(Thien-2-yl)phenyl)thiophene

CAS: 23354-94-1
Formula: C₁₄H₁₀S₂
MW: 242.4 g/mol

ZX-023722

2-(4-Amino-4,5-dihydro-1H-1,2,4-triazol-1-yl)-1-(2,4-difluorophenyl)ethan-1-one

CAS: 2084088-31-1
Formula: C₁₀H₁₀F₂N₄O
MW: 240.21 g/mol

ZX-029539

2-(4-Aminocyclohexyl)acetic Acid

CAS: 1197-54-2
Formula: C₈H₁₅NO₂
MW: 157.21 g/mol

ZX-023788

2-(4-Boc-Piperazino)-5-Bromopyridine

CAS: 153747-97-8
Formula: C₁₄H₂₀BrN₃O₂
MW: 342.23 g/mol

ZX-031881

2-(4-Bromophenyl)-2,2-dimethylacetic Acid

CAS: 32454-35-6
Formula: C₁₀H₁₁BrO₂
MW: 243.1 g/mol

ZX-033104

2-(4-Chloro-3-sulfamoylbenzoyl)benzamide

CAS: 345930-31-6
Formula: C₁₄H₁₁ClN₂O₄S
MW: 338.8 g/mol

ZX-028583

2-(4-Chlorophenoxy)aniline

CAS: 2770-11-8
Formula: C₁₂H₁₀ClNO
MW: 219.66 g/mol

ZX-036427

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