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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4'-((2-Butyl-4-oxo-1,3-diazaspiro[4.4]non-1-en-3-yl)methyl)-N-(4,5-dimethylisoxazol-3-yl)-2'-(ethoxymethyl)-N-(methoxymethyl)-[1,1'-biphenyl]-2-sulfonamide

CAS: 1026355-73-6
Formula: C₃₄H₄₄N₄O₆S
MW: 636.8 g/mol

ZX-027000

4'-((2-Butyl-4-oxo-1,3-diazaspiro[4.4]non-1-en-3-yl)methyl)-N-(4,5-dimethylisoxazol-3-yl)-2'-formyl-[1,1'-biphenyl]-2-sulfonamide

CAS: 254737-96-7
Formula: C₃₀H₃₄N₄O₅S
MW: 562.7 g/mol

ZX-032563

4'-((2-Ethoxy-7-(methoxycarbonyl)-1H-benzo[d]imidazol-1-yl)methyl)-[1,1'-biphenyl]-2-carboxylic Acid

CAS: 1675221-59-6
Formula: C₂₅H₂₂N₂O₅
MW: 430.5 g/mol

ZX-023091

4'-(7-Dechloroquinolinyl) Piperaquine

CAS: 4039-00-3
Formula: C₂₀H₂₈ClN₅
MW: 373.9 g/mol

ZX-026429

4'-(Azidomethyl)-[1,1'-biphenyl]-2-carboxylic acid

CAS: 2758005-15-9
Formula: C₁₄H₁₁N₃O₂
MW: 253.26 g/mol

ZX-025919

4'-(Azidomethyl)[1,1'-biphenyl]-2-carboxamide

CAS: 2763750-28-1
Formula: C₁₄H₁₂N₄O
MW: 252.27 g/mol

ZX-025918

4'-(Chloromethyl)-[1,1'-Biphenyl]-2-carbonitrile

CAS: 136304-93-3
Formula: C₁₄H₁₀ClN
MW: 227.69 g/mol

ZX-026105

4'-(Trifluoromethyl)acetanilide

CAS: 349-97-3
Formula: C₉H₈F₃NO
MW: 203.16 g/mol

ZX-030191

4'-Bromo-2'-fluoroacetanilide

CAS: 326-66-9
Formula: C₈H₇BrFNO
MW: 232.05 g/mol

ZX-034115

4'-Chloro-5-methyl-1,6-dihydro-[1,1'-biphenyl]-3(2H)-one

CAS: 54795-01-6
Formula: C₁₃H₁₃ClO
MW: 220.69 g/mol

ZX-031481

4'-epi-Daunorubicin Hydrochloride

CAS: 56390-08-0
Formula: C₂₇H₃₀ClNO₁₀
MW: 564 g/mol

ZX-036456

4''-(Pentyloxy)-[1,1':4',1''-terphenyl]-4-carboxylic Acid

CAS: 158938-08-0
Formula: C₂₄H₂₄O₃
MW: 360.4 g/mol

ZX-036646

42-O-tert-Butyldimethylsilyloxyethyl Rapamycin

CAS: 159351-68-5
Formula: C₅₉H₉₇NO₁₄Si
MW: 1072.5 g/mol

ZX-029411

4Nitroveratrole

CAS: 709-09-1
Formula: C₈H₉NO₄
MW: 183.16 g/mol

ZX-043624

4α-Methyl-cholest-5-en-3β-ol

CAS: 15073-00-4
Formula: C₂₈H₄₈O
MW: 400.7 g/mol

ZX-023933

5- Bromobenzo[b]thiophene

CAS: 4923-87-9
Formula: C₈H₅BrS
MW: 213.1 g/mol

ZX-036882

5- Methoxy Quinoline -2 (1 H)-One

CAS: 160893-04-9
Formula: C₁₀H₉NO₂
MW: 175.18 g/mol

ZX-028325

5-((2-(2-Fluorophenyl)-4-((methylamino)methyl)-1H-pyrrol-1-yl)sulfonyl)-1,2,3,4-tetrahydropyridin-2-ol

CAS: 2416241-96-6
Formula: C₁₇H₂₀FN₃O₃S
MW: 365.4 g/mol

ZX-027617

5-((2S)-2-Oxido-1,2-dithiolan-3-yl)pentanoic Acid

CAS: 2114407-82-6
Formula: C₈H₁₄O₃S₂
MW: 222.3 g/mol

ZX-030317

5-((4-((1,3-Dimethyl-1H-indazol-6-yl)(methyl)amino)pyrimidin-2-yl)amino)-2-methylbenzenesulfonamide

CAS: 2369664-25-3
Formula: C₂₁H₂₃N₇O₂S
MW: 437.5 g/mol

ZX-031756

5-((4-Bromo-2-fluorophenyl)amino)-4-fluoro-1-methyl-N-(2-(vinyloxy)ethoxy)-1H-benzo[d]imidazole-6-carboxamide

CAS: 1415559-75-9
Formula: C₁₉H₁₇BrF₂N₄O₃
MW: 467.3 g/mol

ZX-031530

5-((Cinnamyloxy)carbonyl)-2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3-carboxylic acid

CAS: 123853-41-8
Formula: C₂₄H₂₂N₂O₆
MW: 434.4 g/mol

ZX-021212

5-(1H-Pyrrol-1-yl)-1,3-dihydro-2H-benzo[d]imidazol-2-one

CAS: 1018229-53-2
Formula: C₁₁H₉N₃O
MW: 199.21 g/mol

ZX-025080

5-(2-((2-(2-(2,2,2-Trifluoroethoxy)phenoxy)ethyl)amino)propyl)-1H-indole-7-carboxamide

CAS: 2052161-50-7
Formula: C₂₂H₂₄F₃N₃O₃
MW: 435.4 g/mol

ZX-032481

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