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-Formyl-2-methoxyphenyl acetate

CAS: 881-68-5
Formula: C₁₀H₁₀O₄
MW: 194.18 g/mol

ZX-036582

4-Formyl-3-methoxybenzamide

CAS: 1289153-30-5
Formula: C₉H₉NO₃
MW: 179.17 g/mol

ZX-039177

4-Formylphthalonitrile

CAS: 313228-48-7
Formula: C₉H₄N₂O
MW: 156.14 g/mol

ZX-031334

4-Formylpiperidine

CAS: 50675-20-2
Formula: C₆H₁₁NO
MW: 113.16 g/mol

ZX-046161

4-Hydrazino Benzene Sulfonamide Hydrochloride

CAS: 27918-19-0
Formula: C₆H₁₀ClN₃O₂S
MW: 223.68 g/mol

ZX-031142

4-Hydrazino-benzoic acid ethyl ester

CAS: 14685-90-6
Formula: C₉H₁₂N₂O₂
MW: 180.2 g/mol

ZX-039753

4-Hydrazinyl-1-methylazepane

CAS: 110406-95-6
Formula: C₇H₁₇N₃
MW: 143.23 g/mol

ZX-028176

4-HydroxyNandrolone

CAS: 4721-69-1
Formula: C₁₈H₂₆O₃
MW: 290.4 g/mol

ZX-046307

4-Iodo-2,6-dimethylaniline

CAS: 4102-53-8
Formula: C₈H₁₀IN
MW: 247.08 g/mol

ZX-032931

4-Iodo-D-phenylalanine

CAS: 62561-75-5
Formula: C₉H₁₀INO₂
MW: 291.09 g/mol

ZX-026210

4-Iodophenylacetic acid

CAS: 1798-06-7
Formula: C₈H₇IO₂
MW: 262.04 g/mol

ZX-045779

4-Isobutoxybenzylamine Acetate

CAS: 955997-89-4
Formula: C₁₃H₂₁NO₃
MW: 239.31 g/mol

ZX-022512

4-Isobutylamino-3-aminoquinoline

CAS: 99010-09-0
Formula: C₁₃H₁₇N₃
MW: 215.29 g/mol

ZX-032878

4-Isobutylbenzoic acid

CAS: 38861-88-0
Formula: C₁₁H₁₄O₂
MW: 178.23 g/mol

ZX-025060

4-Isobutylpiperidine-2,6-dione

CAS: 916982-10-0
Formula: C₉H₁₅NO₂
MW: 169.22 g/mol

ZX-031974

4-Isocyanato-2-trifluoromethylbenzonitrile

CAS: 143782-18-7
Formula: C₉H₃F₃N₂O
MW: 212.13 g/mol

ZX-029278

4-Isothiocyanato-2-(trifluoromethyl)benzoic acid

CAS: 1705583-65-8
Formula: C₉H₄F₃NO₂S
MW: 247.2 g/mol

ZX-029280

4-Mercaptobutyric acid

CAS: 13095-73-3
Formula: C₄H₈O₂S
MW: 120.17 g/mol

ZX-044867

4-Methoxy Lornoxicam

CAS: 2469039-23-2
Formula: C₁₄H₁₂ClN₃O₄S₂
MW: 385.8 g/mol

ZX-025441

4-Methoxy Meloxicam

CAS: 1391051-96-9
Formula: C₁₅H₁₅N₃O₄S₂
MW: 365.4 g/mol

ZX-022083

4-Methoxy phenethyl amine Hydrochloride

CAS: 645-58-9
Formula: C₉H₁₄ClNO
MW: 187.66 g/mol

ZX-031298

4-Methoxy-3-methylphenylacetone

CAS: 16882-23-8
Formula: C₁₁H₁₄O₂
MW: 178.23 g/mol

ZX-030466

4-Methoxy-3,5-dimethyl-2-pyridinemethanol

CAS: 86604-78-6
Formula: C₉H₁₃NO₂
MW: 167.2 g/mol

ZX-031416

4-Methoxy-4-methyl-2-pentanone

CAS: 107-70-0
Formula: C₇H₁₄O₂
MW: 130.18 g/mol

ZX-031084

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