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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Ethyl(S)-2-(3-((2-isopropylthiazol-4-yl)methyl)-3-methylureido)-4-morpholinobutanoate oxalate

CAS: 1247119-35-2
Formula: C₁₉H₃₂N₄O₄S
MW: 412.5 g/mol

ZX-028725

Ethyl2-Chloro-3-oxopropanoate

CAS: 33142-21-1
Formula: C₅H₇ClO₃
MW: 150.56 g/mol

ZX-039187

Ethylene Terephthalate Cyclic Trimer

CAS: 7441-32-9
Formula: C₃₀H₂₄O₁₂
MW: 576.5 g/mol

ZX-025990

Ethynyl Estradiol 3-Sulfate Sodium Salt

CAS: 724762-79-2
Formula: C₂₀H₂₃NaO₅S
MW: 398.4 g/mol

ZX-029374

Etilefrine Impurity E

CAS: 121-71-1
Formula: C₈H₈O₂
MW: 136.15 g/mol

ZX-004724

Etilefrine Impurity F

CAS: 14321-27-8
Formula: C₉H₁₃N
MW: 135.21 g/mol

ZX-021613

Etilevodopa

CAS: 37178-37-3
Formula: C₁₁H₁₅NO₄
MW: 225.24 g/mol

ZX-039356

Etiracetam Carboxylic Acid Ethyl Ester

CAS: 86815-10-3
Formula: C₁₀H₁₇NO₃
MW: 199.25 g/mol

ZX-025357

Etomidate Acid

CAS: 56649-48-0
Formula: C₁₂H₁₂N₂O₂
MW: 216.24 g/mol

ZX-024626

Etonogestrel - Impurity C

CAS: 54024-10-1
Formula: C₂₁H₂₆O₂
MW: 310.4 g/mol

ZX-032920

Etonogestrel Impurity 3

CAS: 149438-01-7
Formula: C₂₂H₃₀O₃
MW: 342.5 g/mol

ZX-036772

Etonogestrel Impurity 5

CAS: 946163-53-7
Formula: C₂₄H₃₂O₃
MW: 368.5 g/mol

ZX-029395

Etoricoxib Impurity 15

CAS: 73312-69-3
Formula: C₅H₈ClNO
MW: 133.57 g/mol

ZX-004725

Etoricoxib Impurity 23

CAS: 1810761-43-3
Formula: C₁₅H₁₆N₂O₃S
MW: 304.4 g/mol

ZX-021638

Etoricoxib impurity 8

CAS: 1421227-97-5
Formula: C₂₂H₂₀N₂O₄S
MW: 408.5 g/mol

ZX-021640

Etoricoxib Impurity 9

CAS: 859824-65-0
Formula: C₁₃H₁₇NO₃S₂
MW: 299.4 g/mol

ZX-029401

Etoricoxib Impurity D

CAS: 221615-75-4
Formula: C₁₅H₁₅NO₃S
MW: 289.4 g/mol

ZX-004726

Etoricoxib impurity J

CAS: 646459-45-2
Formula: C₁₉H₁₇ClN₂O₂S
MW: 372.9 g/mol

ZX-021643

Etoricoxib Related Compound A

CAS: 10297-73-1
Formula: C₉H₁₀O₃S
MW: 198.24 g/mol

ZX-004727

Etoricoxib Related Compound B

CAS: 90536-66-6
Formula: C₉H₁₀O₄S
MW: 214.24 g/mol

ZX-004728

Etravirine 5-Desbromo 6-Chloro Impurity

CAS: 1070377-34-2
Formula: C₂₀H₁₄ClN₅O
MW: 375.8 g/mol

ZX-004729

Etravirine Impurity 12

CAS: 1706943-59-0
Formula: C₂₀H₁₇BrN₆O₂
MW: 453.3 g/mol

ZX-004730

Etravirine Impurity 16

CAS: 2240161-92-4
Formula: C₂₅H₂₄BrN₇O₂
MW: 534.4 g/mol

ZX-004731

Etravirine Impurity 3

CAS: 1398507-09-9
Formula: C₁₁H₇BrClN₅
MW: 324.56 g/mol

ZX-004732

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