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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

Clofarabine Dibenzoate Impurity chemical structure

Clofarabine Dibenzoate Impurity

CAS: 355138-50-0
Formula: C₂₄H₁₉ClFN₅O₅
MW: 511.9 g/mol

VQ-035127

Reference Standard

Clofarabine α-Pyranosyl Formamide Impurity chemical structure

Clofarabine α-Pyranosyl Formamide Impurity

CAS: 1140251-30-4
Formula: C₁₀H₁₃ClFN₅O₄
MW: 321.69 g/mol

VQ-025035

Reference Standard

Clofazimine Iminophenazine Impurity chemical structure

Clofazimine Iminophenazine Impurity

CAS: 1332634-93-1
Formula: C₁₈H₁₃ClN₄
MW: 320.8 g/mol

VQ-047833

Reference Standard

Clofedanol chemical structure

CAS: 791-35-5
Formula: C₁₇H₂₀ClNO
MW: 289.8 g/mol

VQ-029867

Reference Standard

Clomifene Citrate - Impurity C chemical structure

Clomifene Citrate - Impurity C

CAS: 5530-99-4
Formula: C₂₆H₂₉NO₂
MW: 387.5 g/mol

VQ-025044

Reference Standard

Clomifene Citrate - Impurity D chemical structure

Clomifene Citrate - Impurity D

CAS: 1391054-64-0
Formula: C₃₈H₄₆N₂O₃
MW: 578.8 g/mol

VQ-022236

Reference Standard

Clomiphene Impurity 1 chemical structure

Clomiphene Impurity 1

CAS: 73404-00-9
Formula: C₂₆H₃₁NO₂
MW: 389.5 g/mol

VQ-025047

Reference Standard

CLONIDINE IMPURITIES(N-((2,4,6-Trichlorophenyl) carbamothioyl)benzamide)

CLONIDINE IMPURITIES(N-((2,4,6-Trichlorophenyl) carbamothioyl)benzamide)

CAS: 96938-54-4
Formula: C₁₄H₉Cl₃N₂OS
MW: 359.66 g/mol

VQ-036402

Reference Standard

Clonixin Impurity B chemical structure

Clonixin Impurity B

CAS: 17782-10-4
Formula: C₁₄H₁₄N₂O₂
MW: 242.27 g/mol

In stock

Reference Standard

Cloperastine Fendizoate chemical structure

Cloperastine Fendizoate

CAS: 85187-37-7
Formula: C₄₀H₃₈ClNO₅
MW: 648.2 g/mol

VQ-031523

Reference Standard

Clopidogrel 2-Methoxysulphonyl Impurity

Clopidogrel 2-Methoxysulphonyl Impurity

CAS: 2250240-57-2
Formula: C₁₇H₁₈ClNO₅S₂
MW: 415.91 g/mol

In stock

Reference Standard

Clopidogrel 2,3 Analog Dimer Impurity

Clopidogrel 2,3 Analog Dimer Impurity

Formula: C₂₆H₂₈Cl₂N₂O₄S
MW: 535.48 g/mol

In stock

Reference Standard

Clopidogrel 2,4 Analog Dimer Impurity

Clopidogrel 2,4 Analog Dimer Impurity

Formula: C₂₆H₂₈Cl₂N₂O₄S
MW: 535.48 g/mol

In stock

Reference Standard

Clopidogrel 3,4 Analog Dimer Impurity

Clopidogrel 3,4 Analog Dimer Impurity

Formula: C₂₆H₂₈Cl₂N₂O₄S
MW: 535.48 g/mol

In stock

Reference Standard

Clopidogrel CLB 1 Impurity

Clopidogrel CLB 1 Impurity

Formula: C₂₆H₂₈Cl₂N₂O₄S
MW: 535.48 g/mol

VQ-004662

Reference Standard

Clopidogrel Impurity (Mixture of Z and E Isomers) chemical structure

Clopidogrel Impurity (Mixture of Z and E Isomers)

CAS: 19044-66-7
Formula: C₁₂H₂₂O
MW: 182.3 g/mol

In stock

Reference Standard

Clopidogrel Impurity 11

Clopidogrel Impurity 11

CAS: 1427465-90-4
Formula: C₁₅H₁₆ClNO₂S
MW: 309.8 g/mol

VQ-047849

Reference Standard

Clopidogrel Impurity 2 chemical structure

Clopidogrel Impurity 2

CAS: 1396607-49-0
Formula: C₁₆H₁₅BrClNO₂S
MW: 400.7 g/mol

VQ-025061

Reference Standard

Clopidogrel Impurity 4 chemical structure

Clopidogrel Impurity 4

CAS: 801319-16-4
Formula: C₁₄H₁₃ClNS⁺
MW: 262.8 g/mol

VQ-047847

Reference Standard

Clopidogrel Impurity 4 (Freebase) chemical structure

Clopidogrel Impurity 4 (Freebase)

CAS: 68559-60-4
Formula: C₇H₇NOS
MW: 153.2 g/mol

In stock

Reference Standard

Clopidogrel Impurity 4 (Hydrochloride Salt)

Clopidogrel Impurity 4 (Hydrochloride Salt)

Formula: C₇H₇NOS.ClH
MW: 189.66 g/mol

VQ-004665

Reference Standard

Clopidogrel impurity 8 chemical structure

Clopidogrel impurity 8

CAS: 107112-91-4
Formula: C₇H₈ClNS
MW: 173.66 g/mol

VQ-047848

Reference Standard

Clopidogrel Impurity B

Clopidogrel Impurity B

CAS: 402746-56-9
Formula: C₁₅H₁₈ClNO₆S₂
MW: 407.89 g/mol

VQ-029881

Reference Standard

Clopidogrel Impurity B chemical structure

Clopidogrel Impurity B

CAS: 141109-18-4
Formula: C₁₅H₁₇Cl₂NO₂S
MW: 346.3 g/mol

VQ-035203

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