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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

S-2-Pyridylthio Cysteamine Hydrochloride chemical structure

S-2-Pyridylthio Cysteamine Hydrochloride

CAS: 106139-15-5
Formula: C₇H₁₁ClN₂S₂
MW: 222.8 g/mol

VQ-036481

Reference Standard

S-Acetyl L-Glutathione chemical structure

S-Acetyl L-Glutathione

CAS: 3054-47-5
Formula: C₁₂H₁₉N₃O₇S
MW: 349.36 g/mol

VQ-032385

Reference Standard

S-Acetylcysteine chemical structure

S-Acetylcysteine

CAS: 60333-15-5
Formula: C₅H₉NO₃S
MW: 163.2 g/mol

VQ-029013

Reference Standard

S-Adenosylmethioninamine chemical structure

S-Adenosylmethioninamine

CAS: 22365-13-5
Formula: C₁₄H₂₃N₆O₃S⁺
MW: 355.44 g/mol

VQ-028796

Reference Standard

S-Amisulpride chemical structure

CAS: 71675-92-8
Formula: C₁₇H₂₇N₃O₄S
MW: 369.5 g/mol

VQ-029118

Reference Standard

S-Amlodipine Besylate chemical structure

S-Amlodipine Besylate

CAS: 150566-71-5
Formula: C₂₆H₃₁ClN₂O₈S
MW: 567.1 g/mol

VQ-029135

Reference Standard

S-Baclofen Hydrochloride chemical structure

S-Baclofen Hydrochloride

CAS: 63701-56-4
Formula: C₁₀H₁₃Cl₂NO₂
MW: 250.12 g/mol

VQ-035907

Reference Standard

S-Carbamoyl-L-cysteine chemical structure

S-Carbamoyl-L-cysteine

CAS: 5745-86-8
Formula: C₄H₈N₂O₃S
MW: 164.19 g/mol

VQ-047317

Reference Standard

S-Clopidogrel N-Methyl Impurity chemical structure

S-Clopidogrel N-Methyl Impurity

CAS: 1346605-15-9
Formula: C₁₆H₁₈ClNO₂S
MW: 323.8 g/mol

VQ-029890

Reference Standard

S-Deoxo Fulvestrant chemical structure

S-Deoxo Fulvestrant

CAS: 153004-31-0
Formula: C₃₂H₄₇F₅O₂S
MW: 590.8 g/mol

VQ-044414

Reference Standard

S-Deoxo-6-oxo Fulvestrant chemical structure

S-Deoxo-6-oxo Fulvestrant

CAS: 1107606-70-1
Formula: C₃₂H₄₅F₅O₃S
MW: 604.8 g/mol

VQ-037454

Reference Standard

S-Deoxo-delta-6, 7-Fulvestrant chemical structure

S-Deoxo-delta-6, 7-Fulvestrant

CAS: 2170200-16-3
Formula: C₃₂H₄₅F₅O₂S
MW: 588.8 g/mol

VQ-030897

Reference Standard

S-Des-ciclesonide chemical structure

S-Des-ciclesonide

CAS: 161115-60-2
Formula: C₂₈H₃₈O₆
MW: 470.6 g/mol

VQ-036291

Reference Standard

S-Despropylamino S-Methyl Macitentan chemical structure

S-Despropylamino S-Methyl Macitentan

CAS: 556796-88-4
Formula: C₁₇H₁₅Br₂N₅O₄S
MW: 545.2 g/mol

VQ-023023

Reference Standard

S-Methyl Fluticasone Furoate chemical structure

S-Methyl Fluticasone Furoate

CAS: 397864-58-3
Formula: C₂₇H₃₀F₂O₆S
MW: 520.6 g/mol

VQ-030838

Reference Standard

S-Methyl Tiopronin chemical structure

S-Methyl Tiopronin

CAS: 87254-91-9
Formula: C₆H₁₁NO₃S
MW: 177.22 g/mol

VQ-034287

Reference Standard

S-Methyldihydroziprasidone chemical structure

S-Methyldihydroziprasidone

CAS: 194280-91-6
Formula: C₂₂H₂₅ClN₄OS
MW: 429 g/mol

VQ-044358

Reference Standard

S-Mirtazapine chemical structure

CAS: 61337-87-9
Formula: C₁₇H₁₉N₃
MW: 265.35 g/mol

VQ-035146

Reference Standard

S-Modafinil chemical structure

CAS: 112111-47-4
Formula: C₁₅H₁₅NO₂S
MW: 273.4 g/mol

VQ-043779

Reference Standard

S-Norepinephrine chemical structure

S-Norepinephrine

CAS: 2349414-30-6
Formula: C₉H₁₃NO₃
MW: 183.2 g/mol

VQ-032206

Reference Standard

S-Pantoprazole sodium chemical structure

S-Pantoprazole sodium

CAS: 160488-53-9
Formula: C₁₆H₁₄F₂N₃NaO₄S
MW: 405.4 g/mol

VQ-041318

Reference Standard

S-Propyl-2-thiobarbituric Acid chemical structure

S-Propyl-2-thiobarbituric Acid

CAS: 145783-12-6
Formula: C₇H₁₀N₂O₂S
MW: 186.23 g/mol

VQ-023896

Reference Standard

S-Propyl-5-nitro-2-thiobarbituric Acid chemical structure

S-Propyl-5-nitro-2-thiobarbituric Acid

CAS: 145783-13-7
Formula: C₇H₉N₃O₄S
MW: 231.23 g/mol

VQ-028368

Reference Standard

S-Ramosetron chemical structure

CAS: 132036-90-9
Formula: C₁₇H₁₇N₃O
MW: 279.34 g/mol

VQ-043773

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