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Impurities & Reference Standards

Pharmacopoeial and non-pharmacopoeial impurities, metabolites, nitrosamines and working standards with characterisation data for QC and regulatory work.

27,990products

6sub-categories

2,746in stock

COA + SDSwith every lot

API Impurities 14,098 Pharmacopeial Impurities (EP / USP / BP) 4,399 Nitrosamine Impurities 631 Stable Isotope Labelled Standards (Deuterated, 13C, 15N) 1,504 Metabolites & Degradation Products 3,922 API Reference Standards 3,436

Reference Standard

Sevoflurane EP Impurity A chemical structure

Sevoflurane EP Impurity A

CAS: 58109-34-5
Formula: C₄H₂F₆O
MW: 180.05 g/mol

VQ-028014

Reference Standard

Sevoflurane EP Impurity B chemical structure

Sevoflurane EP Impurity B

CAS: 13171-18-1
Formula: C₄H₄F₆O
MW: 182.06 g/mol

VQ-028015

Reference Standard

Sibutramine chemical structure

CAS: 106650-56-0
Formula: C₁₇H₂₆ClN
MW: 279.8 g/mol

VQ-042153

Reference Standard

Sibutramine Hydrochloride chemical structure

Sibutramine Hydrochloride

CAS: 84485-00-7
Formula: C₁₇H₂₇Cl₂N
MW: 316.3 g/mol

VQ-042155

Reference Standard

Sibutramine Hydrochloride Monohydrate chemical structure

Sibutramine Hydrochloride Monohydrate

CAS: 125494-59-9
Formula: C₁₇H₂₉Cl₂NO
MW: 334.3 g/mol

VQ-043292

Reference Standard

Sibutramine Impurity F chemical structure

Sibutramine Impurity F

CAS: 28049-61-8
Formula: C₁₁H₁₀ClN
MW: 191.65 g/mol

VQ-043713

Reference Standard

Sibutramine Impurity J chemical structure

Sibutramine Impurity J

CAS: 186521-85-7
Formula: C₁₅H₁₉ClO
MW: 250.76 g/mol

VQ-043293

Reference Standard

Sildenafil chemical structure

CAS: 139755-83-2
Formula: C₂₂H₃₀N₆O₄S
MW: 474.6 g/mol

VQ-007753

Reference Standard

Sildenafil Aldehyde chemical structure

Sildenafil Aldehyde

CAS: 332374-42-2
Formula: C₁₄H₂₀N₂O₄S
MW: 312.39 g/mol

VQ-033838

Reference Standard

Sildenafil Amino Amide Impurity chemical structure

Sildenafil Amino Amide Impurity

CAS: 139756-02-8
Formula: C₈H₁₄N₄O
MW: 182.22 g/mol

VQ-023746

Reference Standard

Sildenafil Chlorosulfone Impurity chemical structure

Sildenafil Chlorosulfone Impurity

CAS: 139756-22-2
Formula: C₁₇H₁₉ClN₄O₄S
MW: 410.9 g/mol

VQ-023748

Reference Standard

Sildenafil Citrate chemical structure

Sildenafil Citrate

CAS: 171599-83-0
Formula: C₂₈H₃₈N₆O₁₁S
MW: 666.7 g/mol

In stock

Reference Standard

Sildenafil Di-Amide Impurity chemical structure

Sildenafil Di-Amide Impurity

CAS: 139756-03-9
Formula: C₁₇H₂₂N₄O₃
MW: 330.4 g/mol

VQ-023747

Reference Standard

Sildenafil EP Impurity A chemical structure

Sildenafil EP Impurity A

CAS: 1391053-95-4
Formula: C₂₃H₃₂N₆O₄S
MW: 488.6 g/mol

VQ-023749

Reference Standard

Sildenafil EP Impurity B chemical structure

Sildenafil EP Impurity B

CAS: 1094598-75-0
Formula: C₂₂H₃₀N₆O₅S
MW: 490.6 g/mol

VQ-023750

Reference Standard

Sildenafil EP Impurity C chemical structure

Sildenafil EP Impurity C

CAS: 139755-91-2
Formula: C₂₀H₂₆N₆O₄S
MW: 446.5 g/mol

VQ-023751

Reference Standard

Sildenafil EP Impurity D chemical structure

Sildenafil EP Impurity D

CAS: 1357931-55-5
Formula: C₁₇H₂₀N₄O₅S
MW: 392.4 g/mol

In stock

Reference Standard

Sildenafil EP Impurity F chemical structure

Sildenafil EP Impurity F

CAS: 139755-82-1
Formula: C₂₁H₂₈N₆O₄S
MW: 460.6 g/mol

In stock

Reference Standard

Sildenafil EP Impurity G chemical structure

Sildenafil EP Impurity G

CAS: 1346602-67-2
Formula: C₃₈H₄₆N₁₀O₈S₂
MW: 835 g/mol

VQ-021342

Reference Standard

Sildenafil Methyl Sulfonate Ester Impurity chemical structure

Sildenafil Methyl Sulfonate Ester Impurity

CAS: 2512206-40-3
Formula: C₁₈H₂₂N₄O₅S
MW: 406.5 g/mol

VQ-028021

Reference Standard

Sildenafil-d3 chemical structure

CAS: 1126745-90-1
Formula: C₂₂H₃₀N₆O₄S
MW: 477.6 g/mol

VQ-033842

Reference Standard

Sildenafil-d8 chemical structure

CAS: 951385-68-5
Formula: C₂₂H₃₀N₆O₄S
MW: 482.6 g/mol

VQ-033843

Reference Standard

Silodosin chemical structure

CAS: 160970-54-7
Formula: C₂₅H₃₂F₃N₃O₄
MW: 495.5 g/mol

VQ-028026

Reference Standard

Silodosin (S-ISOMER) chemical structure

Silodosin (S-ISOMER)

CAS: 2182279-45-2
Formula: C₂₅H₃₂F₃N₃O₄
MW: 495.5 g/mol

VQ-021344

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