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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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1,516in stock

COA + SDSwith every lot

Reference Standard

Acetyl ketene chemical structure

CAS: 674-82-8
Formula: C₄H₄O₂
MW: 84.07 g/mol

VQ-039020

Reference Standard

Acetyl Methanesulfonate chemical structure

Acetyl Methanesulfonate

CAS: 5539-53-7
Formula: C₃H₆O₄S
MW: 138.14 g/mol

VQ-029563

Reference Standard

Acetyl Valganciclovir chemical structure

Acetyl Valganciclovir

CAS: 960582-59-6
Formula: C₁₆H₂₄N₆O₆
MW: 396.4 g/mol

VQ-034523

Reference Standard

Acetyl Vardenafil chemical structure

Acetyl Vardenafil

CAS: 1261351-28-3
Formula: C₂₅H₃₄N₆O₃
MW: 466.6 g/mol

VQ-023986

Reference Standard

Acetyl-Cyclosporin A Aldehyde chemical structure

Acetyl-Cyclosporin A Aldehyde

CAS: 121584-52-9
Formula: C₆₂H₁₀₉N₁₁O₁₄
MW: 1232.6 g/mol

VQ-029961

Reference Standard

Acetyl-L-Carnitine Hydrochloride chemical structure

Acetyl-L-Carnitine Hydrochloride

CAS: 5080-50-2
Formula: C₉H₁₈ClNO₄
MW: 239.69 g/mol

VQ-038867

Reference Standard

Acetyl(sulfo)-D-alanine chemical structure

Acetyl(sulfo)-D-alanine

CAS: 79560-92-2
Formula: C₅H₉NO₆S
MW: 211.2 g/mol

VQ-043570

Reference Standard

Acetylcysteine Impurity 50 chemical structure

Acetylcysteine Impurity 50

CAS: 24125-26-6
Formula: C₁₄H₂₆N₂O₄
MW: 286.37 g/mol

VQ-047431

Reference Standard

Acetyldesonide chemical structure

CAS: 25092-25-5
Formula: C₂₆H₃₄O₇
MW: 458.5 g/mol

VQ-021909

Reference Standard

Acetylpyrocatechol chemical structure

Acetylpyrocatechol

CAS: 1197-09-7
Formula: C₈H₈O₃
MW: 152.15 g/mol

VQ-026948

Reference Standard

Acetyltaurine chemical structure

CAS: 19213-70-8
Formula: C₄H₉NO₄S
MW: 167.19 g/mol

VQ-035493

Reference Standard

Acetyltributyl Citrate Impurity B chemical structure

Acetyltributyl Citrate Impurity B

CAS: 7568-58-3
Formula: C₁₈H₃₀O₆
MW: 342.4 g/mol

VQ-028510

Reference Standard

Acetyltropic Acid chemical structure

Acetyltropic Acid

CAS: 14510-36-2
Formula: C₁₁H₁₂O₄
MW: 208.21 g/mol

VQ-035854

Reference Standard

Acetylvalerenolic acid chemical structure

Acetylvalerenolic acid

CAS: 81397-67-3
Formula: C₁₇H₂₄O₄
MW: 292.4 g/mol

VQ-042794

Reference Standard

Aciclovir Impurity 1 chemical structure

Aciclovir Impurity 1

CAS: 1195518-98-9
Formula: C₇H₇N₅O₂
MW: 193.16 g/mol

VQ-029022

Reference Standard

Aciclovir Impurity 8

Aciclovir Impurity 8

CAS: 1195360-46-3
Formula: C₁₁H₁₈O₇
MW: 262.26 g/mol

VQ-024138

Reference Standard

Aciclovir Impurity B chemical structure

Aciclovir Impurity B

CAS: 73-40-5
Formula: C₅H₅N₅O
MW: 151.13 g/mol

In stock

Reference Standard

Acitretin Butyl Ester Impurity

Acitretin Butyl Ester Impurity

CAS: 1067630-60-7
Formula: C₂₅H₃₄O₃
MW: 382.5 g/mol

VQ-045434

Reference Standard

Acoltremon Diastereomer chemical structure

Acoltremon Diastereomer

CAS: 1207722-15-3
Formula: C₁₈H₂₇NO₂
MW: 289.4 g/mol

VQ-035773

Reference Standard

Acoltremon Enantiomer chemical structure

Acoltremon Enantiomer

CAS: 3038740-43-8
Formula: C₁₈H₂₇NO₂
MW: 289.4 g/mol

VQ-035772

Reference Standard

Acoltremon Hydroxy Impurity

Acoltremon Hydroxy Impurity

CAS: 824947-53-7
Formula: C₁₇H₂₅NO₂
MW: 275.39 g/mol

VQ-047321

Reference Standard

Acoltremon o-Methoxy Impurity

Acoltremon o-Methoxy Impurity

CAS: 824947-60-6
Formula: C₁₈H₂₇NO₂
MW: 289.41 g/mol

VQ-047322

Reference Standard

Acoltremon p-Methoxy Impurity

Acoltremon p-Methoxy Impurity

CAS: 824947-61-7
Formula: C₁₈H₂₇NO₂
MW: 289.41 g/mol

VQ-047323

Reference Standard

Acoramidis Acetone Acetyl Impurity

Acoramidis Acetone Acetyl Impurity

CAS: 1446701-53-6
Formula: C₁₆H₁₉FO₅
MW: 310.32 g/mol

VQ-029018

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