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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.

28,554products

6sub-categories

2,746in stock

COA + SDSwith every lot

API Impurities 14,252 Pharmacopeial Impurities (EP / USP / BP) 4,401 Nitrosamine Impurities 650 Stable Isotope Labelled Standards (Deuterated, 13C, 15N) 1,612 Metabolites & Degradation Products 4,146 API Reference Standards 3,493

Reference Standard

Buspirone EP Impurity L chemical structure

Buspirone EP Impurity L

CAS: 21098-11-3
Formula: C₁₃H₂₀ClNO₂
MW: 257.75 g/mol

VQ-021929

Reference Standard

Buspirone EP Impurity M chemical structure

Buspirone EP Impurity M

CAS: 80827-62-9
Formula: C₁₃H₂₀BrNO₂
MW: 302.21 g/mol

VQ-021932

Reference Standard

Buspirone EP Impurity N chemical structure

Buspirone EP Impurity N

CAS: 257877-44-4
Formula: C₂₂H₃₂N₂O₄
MW: 388.5 g/mol

VQ-021930

Reference Standard

Buspirone N-Oxide chemical structure

Buspirone N-Oxide

CAS: 220747-81-9
Formula: C₂₁H₃₁N₅O₃
MW: 401.5 g/mol

VQ-021937

Reference Standard

Busulfan chemical structure

CAS: 55-98-1
Formula: C₆H₁₄O₆S₂
MW: 246.3 g/mol

VQ-021940

Reference Standard

Busulfan Impurity 3 chemical structure

Busulfan Impurity 3

CAS: 26978-64-3
Formula: C₄H₁₀O₄S
MW: 154.19 g/mol

VQ-004563

Reference Standard

Busulfan Impurity 3 (DiSodium Salt)

Busulfan Impurity 3 (DiSodium Salt)

Formula: C₄H₁₀O₃S.2Na
MW: 200.15 g/mol

VQ-004564

Reference Standard

Busulfan Impurity 3 (Sodium) chemical structure

Busulfan Impurity 3 (Sodium)

CAS: 31465-25-5
Formula: C₄H₉NaO₄S
MW: 176.17 g/mol

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Reference Standard

Busulfan Methylsulfinyloxy Analog chemical structure

Busulfan Methylsulfinyloxy Analog

CAS: 1797106-48-9
Formula: C₆H₁₄O₅S₂
MW: 230.3 g/mol

VQ-021942

Reference Standard

Busulfan-d8 chemical structure

CAS: 116653-28-2
Formula: C₆H₁₄O₆S₂
MW: 254.4 g/mol

VQ-029564

Reference Standard

Butamben chemical structure

CAS: 94-25-7
Formula: C₁₁H₁₅NO₂
MW: 193.24 g/mol

VQ-029565

Reference Standard

Butamirate chemical structure

CAS: 18109-80-3
Formula: C₁₈H₂₉NO₃
MW: 307.4 g/mol

VQ-021029

Reference Standard

Butamirate Citrate chemical structure

Butamirate Citrate

CAS: 18109-81-4
Formula: C₂₄H₃₇NO₁₀
MW: 499.6 g/mol

VQ-024706

Reference Standard

Butamirate Impurity C Citrate

Butamirate Impurity C Citrate

CAS: 33987-92-7
Formula: C₂₂H₃₃NO₁₀
MW: 471.5 g/mol

VQ-035417

Reference Standard

Butamirate Impurity D chemical structure

Butamirate Impurity D

CAS: 92321-53-4
Formula: C₁₄H₂₁NO
MW: 219.32 g/mol

VQ-021032

Reference Standard

Butamirate-D5 Citrate chemical structure

Butamirate-D5 Citrate

CAS: 1215650-08-0
Formula: C₂₄H₃₇NO₁₀
MW: 504.6 g/mol

VQ-047649

Reference Standard

Butane-1,4-diyl (5Z,5'Z)-bis(7-((1R,2R,3R,5S)-3,5-dihydroxy-2-((R)-3-hydroxy-5-phenylpentyl)cyclopentyl)hept-5-enoate)

Butane-1,4-diyl (5Z,5'Z)-bis(7-((1R,2R,3R,5S)-3,5-dihydroxy-2-((R)-3-hydroxy-5-phenylpentyl)cyclopentyl)hept-5-enoate)

CAS: 2758178-94-6
Formula: C₅₀H₇₄O₁₀
MW: 835.12 g/mol

VQ-048806

Reference Standard

Butane-1,4-diyl bis(3,4-dimethoxybenzoate) chemical structure

Butane-1,4-diyl bis(3,4-dimethoxybenzoate)

CAS: 72782-65-1
Formula: C₂₂H₂₆O₈
MW: 418.4 g/mol

VQ-031749

Reference Standard

Butenafine chemical structure

CAS: 101828-21-1
Formula: C₂₃H₂₇N
MW: 317.5 g/mol

VQ-036064

Reference Standard

Butenafine Hydrochloride chemical structure

Butenafine Hydrochloride

CAS: 101827-46-7
Formula: C₂₃H₂₈ClN
MW: 353.9 g/mol

VQ-024709

Reference Standard

Butenafine Impurity 2 chemical structure

Butenafine Impurity 2

CAS: 122152-13-0
Formula: C₂₃H₃₃N
MW: 323.5 g/mol

VQ-029569

Reference Standard

Butenafine Impurity 5 chemical structure

Butenafine Impurity 5

CAS: 79135-60-7
Formula: C₁₁H₁₄Cl₂
MW: 217.13 g/mol

VQ-047650

Reference Standard

Butetamate chemical structure

CAS: 14007-64-8
Formula: C₁₆H₂₅NO₂
MW: 263.37 g/mol

VQ-024708

Reference Standard

Butoconazole Impurity 6 chemical structure

Butoconazole Impurity 6

CAS: 59363-17-6
Formula: C₁₀H₁₁ClO
MW: 182.64 g/mol

VQ-024711

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