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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

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(S)-2-((6-(3-Aminopiperidin-1-yl)-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)benzonitrile

CAS: 1108732-05-3
Formula: C₁₈H₂₁N₅O₂
MW: 339.4 g/mol

ZX-027785

(S)-2-((Benzyloxy)methyl)oxirane

CAS: 16495-13-9
Formula: C₁₀H₁₂O₂
MW: 164.2 g/mol

ZX-035744

(S)-2-((R)-4-((S)-2-Hydroxypropyl)-2-oxopyrrolidin-1-yl)butanamide

CAS: 357336-94-8
Formula: C₁₁H₂₀N₂O₃
MW: 228.29 g/mol

ZX-028341

(S)-2-((R)-4-((S)-2-Hydroxypropyl)-2-oxopyrrolidin-1-yl)butanoic acid

CAS: 1437631-18-9
Formula: C₁₁H₁₉NO₄
MW: 229.27 g/mol

ZX-028340

(S)-2-((R)-6-Fluorochroman-2-yl)-2-(tosyloxy)ethyl acetate

CAS: 1345202-53-0
Formula: C₂₀H₂₁FO₆S
MW: 408.4 g/mol

ZX-025775

(S)-2-((S)-4-Methyl-2-((S)-2-(2-morpholinoacetamido)-4-phenylbutanamido)pentanamido)-3-phenylpropanoic Acid

CAS: 868540-16-3
Formula: C₃₁H₄₂N₄O₆
MW: 566.7 g/mol

ZX-028470

(S)-2-((tert-Butoxycarbonyl)amino)-2-((1s,3R,5S,7R)-4-oxoadamantan-1-yl)acetic acid

CAS: 2173146-31-9
Formula: C₁₇H₂₅NO₅
MW: 323.4 g/mol

ZX-032413

(S)-2-((tert-Butoxycarbonyl)amino)-3-(4-iodophenyl)propanoic Acid

CAS: 62129-44-6
Formula: C₁₄H₁₈INO₄
MW: 391.2 g/mol

ZX-038885

(S)-2-((tert-Butoxycarbonyl)amino)-4-cyclohexylbutanoic acid

CAS: 143415-51-4
Formula: C₁₅H₂₇NO₄
MW: 285.38 g/mol

ZX-036747

(S)-2-((tert-Butoxycarbonyl)amino)pentane-1,5-diyl Dimethanesulfonate

CAS: 607376-86-3
Formula: C₁₂H₂₅NO₈S₂
MW: 375.5 g/mol

ZX-031197

(S)-2-(1-(3-Ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethyl)isoindoline-1,3-dione

CAS: 2077897-93-7
Formula: C₂₀H₂₁NO₆S
MW: 403.5 g/mol

ZX-028051

(S)-2-(1,6,7,8-Tetrahydro-2H-indeno[5,4-b] furan-8-yl)acetamide

CAS: 221530-38-7
Formula: C₁₃H₁₅NO₂
MW: 217.26 g/mol

ZX-026645

(S)-2-(1,6,7,8-Tetrahydro-2H-indeno[5,4-b]furan-8-yl)acetonitrile

CAS: 1185516-79-3
Formula: C₁₃H₁₃NO
MW: 199.25 g/mol

ZX-032099

(S)-2-(2-(Benzofuran-6-carbonyl)-5-chloro-1,2,3,4-tetrahydroisoquinoline-6-carboxamido)-3-(3-(methylsulfonyl)phenyl)propanoic acid

CAS: 2322380-15-2
Formula: C₂₉H₂₅ClN₂O₇S
MW: 581 g/mol

ZX-044700

(S)-2-(2-Morpholinoacetamido)-4-phenylbutanoic acid

CAS: 1396006-45-3
Formula: C₁₆H₂₂N₂O₄
MW: 306.36 g/mol

ZX-027794

(S)-2-(2-Oxo-4-propyl-2,5-dihydro-1H-pyrrol-1-yl)butanamide

CAS: 357338-13-7
Formula: C₁₁H₁₈N₂O₂
MW: 210.27 g/mol

ZX-023638

(S)-2-(2-Oxopyrrolidin-1-yl)butanenitrile

CAS: 664304-29-4
Formula: C₈H₁₂N₂O
MW: 152.19 g/mol

ZX-030239

(S)-2-(3-((2-Isopropylthiazol-4-yl)methyl)-3-methylureido)butanoic acid

CAS: 1004316-34-0
Formula: C₁₃H₂₁N₃O₃S
MW: 299.39 g/mol

ZX-026751

(S)-2-(3,4-Difluorophenyl)oxirane

CAS: 1006376-63-1
Formula: C₈H₆F₂O
MW: 156.13 g/mol

ZX-032658

(S)-2-(4-((4-Chlorophenyl)(phenyl)methyl)piperazin-1-yl)acetic Acid

CAS: 942193-18-2
Formula: C₁₉H₂₁ClN₂O₂
MW: 344.8 g/mol

ZX-028548

(S)-2-(8-Fluoro-3-(2-methoxy-5-(trifluoromethyl)phenyl)-2-(4-(3-methoxyphenyl)-3,4-dihydropyrazin-1(2H)-yl)-3,4-dihydroquinazolin-4-yl)acetic Acid

CAS: 2991299-71-7
Formula: C₂₉H₂₆F₄N₄O₄
MW: 570.5 g/mol

ZX-030222

(S)-2-(Adamantan-1-yl)-2-(((R)-2-hydroxy-1-phenylethyl)amino)acetic acid hydrochloride

CAS: 361441-96-5
Formula: C₂₀H₂₈ClNO₃
MW: 365.9 g/mol

ZX-032417

(S)-2-(Boc-Amino)-3-(4-carbamoyl-2,6-dimethylphenyl)propanoic Acid

CAS: 623950-02-7
Formula: C₁₇H₂₄N₂O₅
MW: 336.4 g/mol

ZX-036755

(S)-2-[[3-(3-Fluorobenzyl)-4-[(3-fluorobenzyl)oxy]benzyl]amino]propanamide

CAS: 1000370-27-3
Formula: C₂₄H₂₄F₂N₂O₂
MW: 410.5 g/mol

ZX-026874

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