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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

4,5-Dichloronicotinic Acid chemical structure

4,5-Dichloronicotinic Acid

CAS: 473837-10-4
Formula: C₆H₃Cl₂NO₂
MW: 192 g/mol

VQ-047496

Reference Standard

4,5-Dichlorothiophene-2-carboxylic Acid chemical structure

4,5-Dichlorothiophene-2-carboxylic Acid

CAS: 31166-29-7
Formula: C₅H₂Cl₂O₂S
MW: 197.04 g/mol

VQ-027845

Reference Standard

4,5-Difluoro-3-(phenylthio)isobenzofuran-1(3H)-one chemical structure

4,5-Difluoro-3-(phenylthio)isobenzofuran-1(3H)-one

CAS: 2136287-64-2
Formula: C₁₄H₈F₂O₂S
MW: 278.28 g/mol

VQ-043800

Reference Standard

4,5-Difluoro-3-hydroxyisobenzofuran-1(3H)-one chemical structure

4,5-Difluoro-3-hydroxyisobenzofuran-1(3H)-one

CAS: 2136287-63-1
Formula: C₈H₄F₂O₃
MW: 186.11 g/mol

VQ-043799

Reference Standard

4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol chemical structure

4,5-Dihydro-5-methyl-3,4-diphenyl-5-isoxazolol

CAS: 181696-73-1
Formula: C₁₆H₁₅NO₂
MW: 253.29 g/mol

VQ-033066

Reference Standard

4,5-Dimethoxy-1-(aminomethyl)benzocyclobutane chemical structure

4,5-Dimethoxy-1-(aminomethyl)benzocyclobutane

CAS: 73344-75-9
Formula: C₁₁H₁₅NO₂
MW: 193.24 g/mol

VQ-037776

Reference Standard

4,5-Dimethoxy-1-benzocyclobutenecarbonitrile chemical structure

4,5-Dimethoxy-1-benzocyclobutenecarbonitrile

CAS: 35202-54-1
Formula: C₁₁H₁₁NO₂
MW: 189.21 g/mol

VQ-031320

Reference Standard

4,5-Dimethoxy-2-nitrobenzonitrile chemical structure

4,5-Dimethoxy-2-nitrobenzonitrile

CAS: 102714-71-6
Formula: C₉H₈N₂O₄
MW: 208.17 g/mol

VQ-048088

Reference Standard

4,5-Dinitrochrysazin chemical structure

4,5-Dinitrochrysazin

CAS: 81-55-0
Formula: C₁₄H₆N₂O₈
MW: 330.21 g/mol

VQ-050696

Reference Standard

4,5-Diphenyl-1H-imidazole-2-propanoic Acid chemical structure

4,5-Diphenyl-1H-imidazole-2-propanoic Acid

CAS: 55217-15-7
Formula: C₁₈H₁₆N₂O₂
MW: 292.3 g/mol

VQ-027323

Reference Standard

4,5-Epoxy Eplerenone chemical structure

4,5-Epoxy Eplerenone

CAS: 209253-73-6
Formula: C₂₄H₃₀O₇
MW: 430.5 g/mol

VQ-030514

Reference Standard

4,5-O-(1-Methylethylidene)-β-D-fructopyranose chemical structure

4,5-O-(1-Methylethylidene)-β-D-fructopyranose

CAS: 912456-61-2
Formula: C₉H₁₆O₆
MW: 220.22 g/mol

VQ-042609

Reference Standard

4,5,6-Trichloronicotinicacid chemical structure

4,5,6-Trichloronicotinicacid

CAS: 847608-28-0
Formula: C₆H₂Cl₃NO₂
MW: 226.4 g/mol

VQ-047497

Reference Standard

4,5,6,7-Tetrafluoro-2-phenylisoindoline-1,3-dione chemical structure

4,5,6,7-Tetrafluoro-2-phenylisoindoline-1,3-dione

CAS: 116508-58-8
Formula: C₁₄H₅F₄NO₂
MW: 295.19 g/mol

VQ-049945

Reference Standard

4,5,6,7-Tetrahydrothiazolo[4,5-c]pyridin-2-amine chemical structure

4,5,6,7-Tetrahydrothiazolo[4,5-c]pyridin-2-amine

CAS: 1781640-92-3
Formula: C₆H₉N₃S
MW: 155.22 g/mol

VQ-048126

Reference Standard

4,5,6,7-Tetrahydrothiazolo[5,4-c]pyridine-2-carboxylic Acid Hydrochloride chemical structure

4,5,6,7-Tetrahydrothiazolo[5,4-c]pyridine-2-carboxylic Acid Hydrochloride

CAS: 1190971-73-3
Formula: C₇H₉ClN₂O₂S
MW: 220.68 g/mol

VQ-036885

Reference Standard

4,5,6,7-Tetrahydrothieno[2,3-c]pyridine Hydrochloride chemical structure

4,5,6,7-Tetrahydrothieno[2,3-c]pyridine Hydrochloride

CAS: 28783-38-2
Formula: C₇H₁₀ClNS
MW: 175.68 g/mol

VQ-027571

Reference Standard

4,5,6,7-Tetrahydrothieno[3,2-c]pyridin-2(3H)-one Hydrochloride chemical structure

4,5,6,7-Tetrahydrothieno[3,2-c]pyridin-2(3H)-one Hydrochloride

CAS: 951380-43-1
Formula: C₇H₁₀ClNOS
MW: 191.68 g/mol

VQ-043584

Reference Standard

4,5'-Di(desmethyl) Omeprazole Sulfide chemical structure

4,5'-Di(desmethyl) Omeprazole Sulfide

CAS: 176219-12-8
Formula: C₁₅H₁₅N₃O₂S
MW: 301.4 g/mol

In stock

Reference Standard

4,5a-Dihydronorethisterone chemical structure

4,5a-Dihydronorethisterone

CAS: 52-79-9
Formula: C₂₀H₂₈O₂
MW: 300.4 g/mol

VQ-023295

Reference Standard

4,6-Di-tert-butyl-m-cresol chemical structure

4,6-Di-tert-butyl-m-cresol

CAS: 497-39-2
Formula: C₁₅H₂₄O
MW: 220.35 g/mol

VQ-032365

Reference Standard

4,6-Dibromo-olivetol chemical structure

4,6-Dibromo-olivetol

CAS: 78463-34-0
Formula: C₁₁H₁₄Br₂O₂
MW: 338.04 g/mol

VQ-036122

Reference Standard

4,6-Dichloro-2-(propylsulfinyl)pyrimidin-5-amine chemical structure

4,6-Dichloro-2-(propylsulfinyl)pyrimidin-5-amine

CAS: 1823431-32-8
Formula: C₇H₉Cl₂N₃OS
MW: 254.14 g/mol

VQ-042513

Reference Standard

4,6-Dichloro-2-(propylthio)pyrimidine chemical structure

4,6-Dichloro-2-(propylthio)pyrimidine

CAS: 1401318-10-2
Formula: C₇H₈Cl₂N₂S
MW: 223.12 g/mol

VQ-034243

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