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Impurities & Reference Standards

API Impurities

Source 1942 api impurities for research, QC and production, documented with COA and SDS.

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Reference Standard

Colesevelam Bromoquat Impurity chemical structure

Colesevelam Bromoquat Impurity

CAS: 32765-81-4
Formula: C₉H₂₁Br₂N
MW: 303.08 g/mol

VQ-025079

Reference Standard

Colesevelam Hydroxyquat Impurity

Colesevelam Hydroxyquat Impurity

CAS: 676578-21-5
Formula: C₉H₂₂NOCl
MW: 195.73 g/mol

VQ-029928

Reference Standard

Colesevelam Impurity 2 chemical structure

Colesevelam Impurity 2

CAS: 33968-67-1
Formula: C₉H₂₄Br₂N₂
MW: 320.11 g/mol

VQ-025077

Reference Standard

Colesevelam Methoxyquat Impurity

Colesevelam Methoxyquat Impurity

CAS: 863031-14-5
Formula: C₁₀H₂₄INO
MW: 301.21 g/mol

VQ-025080

Reference Standard

Colestipol Hydrochloride chemical structure

Colestipol Hydrochloride

CAS: 37296-80-3
Formula: C₈H₂₄ClN₅
MW: 225.76 g/mol

VQ-029930

Reference Standard

Colistimethate sodium chemical structure

Colistimethate sodium

CAS: 8068-28-8
Formula: C₄₅H₈₅N₁₃O₁₀
MW: 968.2 g/mol

VQ-043460

Reference Standard

Conduritol B Epoxide chemical structure

Conduritol B Epoxide

CAS: 6090-95-5
Formula: C₆H₁₀O₅
MW: 162.14 g/mol

VQ-041031

Reference Standard

Coprostanol chemical structure

CAS: 360-68-9
Formula: C₂₇H₄₈O
MW: 388.7 g/mol

VQ-039641

Reference Standard

Cornigerine chemical structure

CAS: 6877-25-4
Formula: C₂₁H₂₁NO₆
MW: 383.4 g/mol

VQ-025076

Reference Standard

Cortexolone 17-Acetate chemical structure

Cortexolone 17-Acetate

CAS: 19357-45-0
Formula: C₂₃H₃₂O₅
MW: 388.5 g/mol

VQ-035482

Reference Standard

Cortexolone Impurity A chemical structure

Cortexolone Impurity A

CAS: 853-27-0
Formula: C₂₁H₂₈O₃
MW: 328.4 g/mol

VQ-031096

Reference Standard

Cortienic Acid chemical structure

CAS: 3597-45-3
Formula: C₂₀H₂₈O₅
MW: 348.4 g/mol

VQ-026076

Reference Standard

Cortisol Impurity B ((E)-17-deoxyaldehyde derivative) chemical structure

Cortisol Impurity B ((E)-17-deoxyaldehyde derivative)

CAS: 105562-12-7
Formula: C₂₁H₂₈O₄
MW: 344.4 g/mol

VQ-022805

Reference Standard

Cortisol Impurity C ((Z)-17-deoxyaldehyde derivative) chemical structure

Cortisol Impurity C ((Z)-17-deoxyaldehyde derivative)

CAS: 105562-13-8
Formula: C₂₁H₂₈O₄
MW: 344.4 g/mol

VQ-026071

Reference Standard

Cortisone 21-succinate chemical structure

Cortisone 21-succinate

CAS: 10215-75-5
Formula: C₂₅H₃₂O₈
MW: 460.5 g/mol

VQ-031097

Reference Standard

Cortisone Acetate chemical structure

Cortisone Acetate

CAS: 50-04-4
Formula: C₂₃H₃₀O₆
MW: 402.5 g/mol

VQ-025085

Reference Standard

Cortisone Sodium Succinate chemical structure

Cortisone Sodium Succinate

CAS: 7415-42-1
Formula: C₂₅H₃₁NaO₈
MW: 482.5 g/mol

VQ-031087

Reference Standard

Crisaborole Impurity 8

Crisaborole Impurity 8

CAS: 2247753-96-2
Formula: C₂₀H₂₄BrNO₂Si
MW: 418.41 g/mol

VQ-036447

Reference Standard

Crisaborole Impurity A chemical structure

Crisaborole Impurity A

CAS: 888967-63-3
Formula: C₁₄H₁₁NO₂
MW: 225.24 g/mol

In stock

Reference Standard

Crisaborole Impurity C chemical structure

Crisaborole Impurity C

CAS: 1187187-01-4
Formula: C₁₄H₁₅BClNO₃
MW: 291.54 g/mol

VQ-036445

Reference Standard

Crisaborole o-Isomer chemical structure

Crisaborole o-Isomer

CAS: 906673-30-1
Formula: C₁₄H₁₀BNO₃
MW: 251.05 g/mol

VQ-043125

Reference Standard

Crizotinib Amine Impurity chemical structure

Crizotinib Amine Impurity

CAS: 877397-71-2
Formula: C₁₃H₁₁Cl₂FN₂O
MW: 301.14 g/mol

VQ-025092

Reference Standard

Crotonobetaine Hydrochloride chemical structure

Crotonobetaine Hydrochloride

CAS: 6538-82-5
Formula: C₇H₁₄ClNO₂
MW: 179.64 g/mol

VQ-022960

Reference Standard

Cyamemazine Cyano Impurity chemical structure

Cyamemazine Cyano Impurity

CAS: 38642-74-9
Formula: C₁₃H₈N₂S
MW: 224.28 g/mol

VQ-029944

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