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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tert-Butyl (R)-(2-(5-bromo-3-(2-fluoro-6-(trifluoromethyl)benzyl)-4-methyl-2,6-dioxo-3,6-dihydropyrimidin-1(2H)-yl)-1-phenylethyl)carbamate

CAS: 830346-49-1
Formula: C₂₆H₂₆BrF₄N₃O₄
MW: 600.4 g/mol

ZX-024466

tert-Butyl (R)-3-Methyl-1,4-diazepane-1-carboxylate

CAS: 223644-10-8
Formula: C₁₁H₂₂N₂O₂
MW: 214.3 g/mol

ZX-032212

tert-Butyl (R)-4-(4-(6-amino-5-(1-(2,6-dichloro-3-fluorophenyl)ethoxy)pyridin-3-yl)-1H-pyrazol-1-yl)piperidine-1-carboxylate

CAS: 877399-51-4
Formula: C₂₆H₃₀Cl₂FN₅O₃
MW: 550.4 g/mol

ZX-021297

Tert-Butyl (S)-(1-oxo-1-phenylhex-5-yn-2-yl)carbamate

CAS: 1538628-99-7
Formula: C₁₇H₂₁NO₃
MW: 287.35 g/mol

ZX-027568

tert-Butyl (S)-(4-(3-chloro-2-(phenylcarbamoyl)phenyl)-3-oxobutan-2-yl)carbamate

CAS: 1386861-47-7
Formula: C₂₂H₂₅ClN₂O₄
MW: 416.9 g/mol

ZX-021498

tert-Butyl (S)-3-(4-(7-carbamoyl-2H-indazol-2-yl)phenyl)piperidine-1-carboxylate

CAS: 1038916-11-8
Formula: C₂₄H₂₈N₄O₃
MW: 420.5 g/mol

ZX-022290

tert-Butyl (S)-3-amino-2-(4-fluoro-3,5-dimethylphenyl)-4-methyl-2,4,6,7-tetrahydro-5H-pyrazolo[4,3-c]pyridine-5-carboxylate

CAS: 2212021-59-3
Formula: C₂₀H₂₇FN₄O₂
MW: 374.5 g/mol

ZX-033977

tert-Butyl (S)-4-((4-fluoroisoquinolin-5-yl)sulfonyl)-3-methyl-1,4-diazepane-1-carboxylate

CAS: 1360538-86-8
Formula: C₂₀H₂₆FN₃O₄S
MW: 423.5 g/mol

ZX-032211

tert-Butyl (trans-4-(2-oxoethyl)cyclohexyl)carbamate

CAS: 215790-29-7
Formula: C₁₃H₂₃NO₃
MW: 241.33 g/mol

ZX-023787

tert-Butyl (Z)-2-((2-methoxy-2-oxoethoxy)imino)-3-oxobutanoate

CAS: 84080-68-2
Formula: C₁₁H₁₇NO₆
MW: 259.26 g/mol

ZX-023825

Tert-Butyl [(1R,5S,6S)-6-(aminomethyl)-3-ethylbicyclo[3.2.0]hept-3-en-6-yl]acetate

CAS: 1138245-20-1
Formula: C₁₆H₂₇NO₂
MW: 265.39 g/mol

ZX-025653

tert-Butyl [(4R,6S)-6-(chloromethyl)-2,2-dimethyl-1,3-dioxan-4-yl]acetate

CAS: 154026-94-5
Formula: C₁₃H₂₃ClO₄
MW: 278.77 g/mol

ZX-022533

tert-Butyl [cis-4-(2-oxoethyl)cyclohexyl]carbamate

CAS: 847417-37-2
Formula: C₁₃H₂₃NO₃
MW: 241.33 g/mol

ZX-028477

tert-Butyl 2-((1R,5S,6R)-6-(aminomethyl)-3-ethylbicyclo[3.2.0]hept-3-en-6-yl)acetate

CAS: 1415817-44-5
Formula: C₁₆H₂₇NO₂
MW: 265.39 g/mol

ZX-030657

tert-Butyl 2-((1R,5S,6S)-3-ethyl-6-(nitromethyl)bicyclo[3.2.0]hept-3-en-6-yl)acetate

CAS: 1138246-18-0
Formula: C₁₆H₂₅NO₄
MW: 295.37 g/mol

ZX-030655

tert-Butyl 2-((4R,6R)-6-((E)-2-(4-(4-fluorophenyl)-6-isopropyl-2-(N-methylmethylsulfonamido)pyrimidin-5-yl)vinyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate

CAS: 2758676-77-4
Formula: C₂₉H₄₀FN₃O₆S
MW: 577.7 g/mol

ZX-026815

tert-Butyl 2-((4R,6R)-6-(chloromethyl)-2,2-dimethyl-1.3-dioxan-4-yl)acetate

CAS: 521974-01-6
Formula: C₁₃H₂₃ClO₄
MW: 278.77 g/mol

ZX-032314

tert-Butyl 2-((4R,6R)-6-formyl-2,2-dimethyl-1,3-dioxan-4-yl)acetate

CAS: 2124275-54-1
Formula: C₁₃H₂₂O₅
MW: 258.31 g/mol

ZX-026817

tert-Butyl 2-((4S,6R)-6-(chloromethyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate

CAS: 521973-99-9
Formula: C₁₃H₂₃ClO₄
MW: 278.77 g/mol

ZX-025460

tert-Butyl 2-((4S,6S)-6-((E)-2-(4-(4-fluorophenyl)-6-isopropyl-2-(N-methylmethylsulfonamido)pyrimidin-5-yl)vinyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate

CAS: 1378943-63-5
Formula: C₂₉H₄₀FN₃O₆S
MW: 577.7 g/mol

ZX-027726

tert-Butyl 2-((4S,6S)-6-(chloromethyl(02,2-1,3-dioxan-4-yl)acetate

CAS: 521974-00-5
Formula: C₁₃H₂₃ClO₄
MW: 278.77 g/mol

ZX-026822

tert-Butyl 2-((5,6-diphenylpyrazin-2-yl)oxy)acetate

CAS: 162928-03-2
Formula: C₂₂H₂₂N₂O₃
MW: 362.4 g/mol

ZX-032435

tert-Butyl 2-(furan-2-yl)acetate

CAS: 65372-09-0
Formula: C₁₀H₁₄O₃
MW: 182.22 g/mol

ZX-026820

tert-Butyl 2-[(4R,6S)-6-(acetyloxymethyl)-2,2-dimethyl-1,3-dioxan-4-yl]acetate

CAS: 154026-95-6
Formula: C₁₅H₂₆O₆
MW: 302.36 g/mol

ZX-032301

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