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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

Rizatriptan N,N,N-Trimethylethanammonium Chloride chemical structure

Rizatriptan N,N,N-Trimethylethanammonium Chloride

CAS: 1030849-63-8
Formula: C₁₆H₂₂N₅⁺
MW: 284.38 g/mol

VQ-033620

Reference Standard

Robenacoxib Impurity A chemical structure

Robenacoxib Impurity A

CAS: 20172-36-5
Formula: C₁₀H₁₂ClNO
MW: 197.66 g/mol

VQ-041974

Reference Standard

Robenacoxib Impurity E

Robenacoxib Impurity E

CAS: 2192217-93-7
Formula: C₁₄H₇F₄NO
MW: 281.21 g/mol

VQ-033626

Reference Standard

Robenacoxib Impurity F

Robenacoxib Impurity F

CAS: 2192217-92-6
Formula: C₁₄H₉F₄NO₂
MW: 299.22 g/mol

VQ-033627

Reference Standard

Rocuronium Impurity 12 chemical structure

Rocuronium Impurity 12

CAS: 50588-42-6
Formula: C₂₁H₃₀O₂
MW: 314.5 g/mol

In stock

Reference Standard

Rocuronium Impurity 5 chemical structure

Rocuronium Impurity 5

CAS: 2569023-19-2
Formula: C₃₁H₅₁BrN₂O₅
MW: 611.7 g/mol

VQ-041978

Reference Standard

Roflumilast Dicyclopropylmethoxy Impurity chemical structure

Roflumilast Dicyclopropylmethoxy Impurity

CAS: 1391052-24-6
Formula: C₂₀H₂₀Cl₂N₂O₃
MW: 407.3 g/mol

In stock

Reference Standard

Roflumilast Dimer chemical structure

Roflumilast Dimer

CAS: 1352122-37-2
Formula: C₂₉H₂₄Cl₂F₄N₂O₆
MW: 643.4 g/mol

VQ-033630

Reference Standard

Roflumilast dimethylcarbamate

Roflumilast dimethylcarbamate

CAS: 2048860-65-5
Formula: C₁₆H₁₃Cl₂F₂N₃O₄
MW: 420.2 g/mol

VQ-033636

Reference Standard

Roflumilast Impurity 9 chemical structure

Roflumilast Impurity 9

CAS: 162401-78-7
Formula: C₁₂H₁₂F₂O₃
MW: 242.22 g/mol

VQ-045346

Reference Standard

Roflumilast Impurity B chemical structure

Roflumilast Impurity B

CAS: 1391052-76-8
Formula: C₁₃H₈Cl₂F₂N₂O₃
MW: 349.11 g/mol

VQ-033632

Reference Standard

Ropinirole Aminoacetic Acid chemical structure

Ropinirole Aminoacetic Acid

CAS: 920755-10-8
Formula: C₁₆H₂₆N₂O₂
MW: 278.39 g/mol

VQ-027893

Reference Standard

Ropinirole Cyclopentanylindolinone Impurity chemical structure

Ropinirole Cyclopentanylindolinone Impurity

CAS: 1368745-05-4
Formula: C₁₀H₉NO
MW: 159.18 g/mol

VQ-027891

Reference Standard

Ropinirole Impurity 18 chemical structure

Ropinirole Impurity 18

CAS: 1072875-70-7
Formula: C₁₆H₂₄N₂O₅
MW: 324.37 g/mol

VQ-033460

Reference Standard

Ropinirole Impurity 3

Ropinirole Impurity 3

CAS: 120427-96-5
Formula: C₁₀H₁₀BrNO
MW: 240.1 g/mol

VQ-041997

Reference Standard

Ropinirole Impurity C chemical structure

Ropinirole Impurity C

CAS: 954117-24-9
Formula: C₁₀H₁₁NO
MW: 161.2 g/mol

VQ-041995

Reference Standard

Ropinirole methylene dimer chemical structure

Ropinirole methylene dimer

CAS: 1800102-50-4
Formula: C₃₃H₄₈N₄O₂
MW: 532.8 g/mol

VQ-027895

Reference Standard

Ropinirole N,N-Methylene Dimer chemical structure

Ropinirole N,N-Methylene Dimer

CAS: 2724840-11-1
Formula: C₃₃H₄₈N₄O₂
MW: 532.8 g/mol

VQ-043282

Reference Standard

Rosuvastatin (2S,4S)-Lactone chemical structure

Rosuvastatin (2S,4S)-Lactone

CAS: 1809092-87-2
Formula: C₂₂H₂₆FN₃O₅S
MW: 463.5 g/mol

VQ-044650

Reference Standard

Rosuvastatin (3R,5R)-Isomer Methyl Ester chemical structure

Rosuvastatin (3R,5R)-Isomer Methyl Ester

CAS: 1776088-23-3
Formula: C₂₃H₃₀FN₃O₆S
MW: 495.6 g/mol

VQ-027910

Reference Standard

Rosuvastatin (3R,5R)-Isomer t-Butyl Ester chemical structure

Rosuvastatin (3R,5R)-Isomer t-Butyl Ester

CAS: 2162136-65-2
Formula: C₂₆H₃₆FN₃O₆S
MW: 537.6 g/mol

VQ-023689

Reference Standard

Rosuvastatin (3S,5R)-Isomer Methyl Ester chemical structure

Rosuvastatin (3S,5R)-Isomer Methyl Ester

CAS: 1112048-62-0
Formula: C₂₉H₄₀FN₃O₇S
MW: 593.7 g/mol

VQ-033664

Reference Standard

Rosuvastatin (3S,5S)-Isomer Calcium chemical structure

Rosuvastatin (3S,5S)-Isomer Calcium

CAS: 2185805-14-3
Formula: C₄₄H₅₄CaF₂N₆O₁₂S₂
MW: 1001.1 g/mol

VQ-043285

Reference Standard

Rosuvastatin (3S,5S)-Isomer t-Butyl Ester chemical structure

Rosuvastatin (3S,5S)-Isomer t-Butyl Ester

CAS: 2185805-16-5
Formula: C₂₆H₃₆FN₃O₆S
MW: 537.6 g/mol

VQ-027916

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