Skip to content

Product division

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-(4-Chlorophenyl)-1,2,3,6-tetrahydropyridine Monohydrochloride chemical structure

4-(4-Chlorophenyl)-1,2,3,6-tetrahydropyridine Monohydrochloride

CAS: 51304-61-1
Formula: C₁₁H₁₃Cl₂N
MW: 230.13 g/mol

VQ-037571

Reference Standard

4-(4-Chlorophenyl)-1H-2,3-benzoxazin-1-one chemical structure

4-(4-Chlorophenyl)-1H-2,3-benzoxazin-1-one

CAS: 2224-83-1
Formula: C₁₄H₈ClNO₂
MW: 257.67 g/mol

VQ-029328

Reference Standard

4-(4-Chlorophenyl)-2-(4-ethylpiperazin-1-yl)-5,6,7,8,9,10-hexahydrocycloocta[b]pyridine chemical structure

4-(4-Chlorophenyl)-2-(4-ethylpiperazin-1-yl)-5,6,7,8,9,10-hexahydrocycloocta[b]pyridine

CAS: 132810-87-8
Formula: C₂₃H₃₀ClN₃
MW: 384 g/mol

VQ-029467

Reference Standard

4-(4-Chlorophenyl)cyclohexane-1-carboxylic Acid chemical structure

4-(4-Chlorophenyl)cyclohexane-1-carboxylic Acid

CAS: 95233-37-7
Formula: C₁₃H₁₅ClO₂
MW: 238.71 g/mol

VQ-044232

Reference Standard

4-(4-Chlorophenyl)piperidine-2,6-dione chemical structure

4-(4-Chlorophenyl)piperidine-2,6-dione

CAS: 84803-46-3
Formula: C₁₁H₁₀ClNO₂
MW: 223.65 g/mol

VQ-021729

Reference Standard

4-(4-Chlorothiophen-2-yl)thiazol-2-amine chemical structure

4-(4-Chlorothiophen-2-yl)thiazol-2-amine

CAS: 570407-10-2
Formula: C₇H₅ClN₂S₂
MW: 216.7 g/mol

VQ-024445

Reference Standard

4-(4-Cyano-2-methoxyphenyl)-5-ethoxy-2,8-dimethyl-1,4-dihydro-1,6-naphthyridine-3-carboxylic Acid chemical structure

4-(4-Cyano-2-methoxyphenyl)-5-ethoxy-2,8-dimethyl-1,4-dihydro-1,6-naphthyridine-3-carboxylic Acid

CAS: 1050477-45-6
Formula: C₂₁H₂₁N₃O₄
MW: 379.4 g/mol

VQ-022647

Reference Standard

4-(4-Cyanobenzyl)-1,2,4-triazole chemical structure

4-(4-Cyanobenzyl)-1,2,4-triazole

CAS: 112809-27-5
Formula: C₁₀H₈N₄
MW: 184.2 g/mol

VQ-048844

Reference Standard

4-(4-Ethyl-2,6-diiodophenoxy)-2,6-diiodo-phenol chemical structure

4-(4-Ethyl-2,6-diiodophenoxy)-2,6-diiodo-phenol

CAS: 176258-89-2
Formula: C₁₄H₁₀I₄O₂
MW: 717.84 g/mol

VQ-043506

Reference Standard

4-(4-Ethyl-3-iodophenyl)-4-methyl-3-oxopentanoic Acid

4-(4-Ethyl-3-iodophenyl)-4-methyl-3-oxopentanoic Acid

CAS: 2234855-03-7
Formula: C₁₄H₁₇IO₃
MW: 360.19 g/mol

VQ-035651

Reference Standard

4-(4-Fluoro-2-methylphenyl)-5-nitropyridin-2(1H)-one chemical structure

4-(4-Fluoro-2-methylphenyl)-5-nitropyridin-2(1H)-one

CAS: 2642577-27-1
Formula: C₁₂H₉FN₂O₃
MW: 248.21 g/mol

VQ-030439

Reference Standard

4-(4-Fluoro-3-(4-(4-hydroxybutanoyl)piperazine-1-carbonyl)benzyl)phthalazin-1(2H)-one chemical structure

4-(4-Fluoro-3-(4-(4-hydroxybutanoyl)piperazine-1-carbonyl)benzyl)phthalazin-1(2H)-one

CAS: 2514757-44-7
Formula: C₂₄H₂₅FN₄O₄
MW: 452.5 g/mol

VQ-049293

Reference Standard

4-(4-Fluorobenzoyl) piperidine hydrochloride chemical structure

4-(4-Fluorobenzoyl) piperidine hydrochloride

CAS: 25519-78-2
Formula: C₁₂H₁₅ClFNO
MW: 243.7 g/mol

VQ-052356

Reference Standard

4-(4-Fluorobenzoyl)-Butyric acid chemical structure

4-(4-Fluorobenzoyl)-Butyric acid

CAS: 149437-76-3
Formula: C₁₁H₁₁FO₃
MW: 210.2 g/mol

VQ-027202

Reference Standard

4-(4-Fluorophenyl)-5,6,7,8,9,10-hexahydrocycloocta[b]pyridin-2(1H)-one chemical structure

4-(4-Fluorophenyl)-5,6,7,8,9,10-hexahydrocycloocta[b]pyridin-2(1H)-one

CAS: 132812-72-7
Formula: C₁₇H₁₈FNO
MW: 271.33 g/mol

VQ-047604

Reference Standard

4-(4-Fluorophenyl)-6-(1-methylethyl)-2-[methyl(methylsulfonyl)amino]-5-pyrimidinecarboxylic acid chemical structure

4-(4-Fluorophenyl)-6-(1-methylethyl)-2-[methyl(methylsulfonyl)amino]-5-pyrimidinecarboxylic acid

CAS: 1263475-93-9
Formula: C₁₆H₁₈FN₃O₄S
MW: 367.4 g/mol

VQ-027906

Reference Standard

4-(4-Hydroxy-3-(hydroxymethyl)phenoxy)benzonitrile chemical structure

4-(4-Hydroxy-3-(hydroxymethyl)phenoxy)benzonitrile

CAS: 2803552-55-6
Formula: C₁₄H₁₁NO₃
MW: 241.24 g/mol

VQ-025089

Reference Standard

4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodo-benzenemethanol chemical structure

4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodo-benzenemethanol

CAS: 2055-94-9
Formula: C₁₃H₈I₄O₃
MW: 719.82 g/mol

VQ-026459

Reference Standard

4-(4-Hydroxy-4-methylpentyl)cyclohex-3-enecarbaldehyde chemical structure

4-(4-Hydroxy-4-methylpentyl)cyclohex-3-enecarbaldehyde

CAS: 31906-04-4
Formula: C₁₃H₂₂O₂
MW: 210.31 g/mol

VQ-051852

Reference Standard

4-(4-Hydroxyphenyl)piperazine-1-carbaldehyde chemical structure

4-(4-Hydroxyphenyl)piperazine-1-carbaldehyde

CAS: 112190-13-3
Formula: C₁₁H₁₄N₂O₂
MW: 206.24 g/mol

VQ-048744

Reference Standard

4-(4-Methoxybenzamido)butanoic Acid chemical structure

4-(4-Methoxybenzamido)butanoic Acid

CAS: 72432-14-5
Formula: C₁₂H₁₅NO₄
MW: 237.25 g/mol

VQ-024303

Reference Standard

4-(4-Methoxyphenyl)butyric acid chemical structure

4-(4-Methoxyphenyl)butyric acid

CAS: 4521-28-2
Formula: C₁₁H₁₄O₃
MW: 194.23 g/mol

VQ-024171

Reference Standard

4-(4-Methylphenyl)-4-oxobutyric Acid chemical structure

4-(4-Methylphenyl)-4-oxobutyric Acid

CAS: 4619-20-9
Formula: C₁₁H₁₂O₃
MW: 192.21 g/mol

VQ-034763

Reference Standard

4-(4-Methylpiperazinomethyl)-3-(trifluoromethyl)aniline chemical structure

4-(4-Methylpiperazinomethyl)-3-(trifluoromethyl)aniline

CAS: 694499-26-8
Formula: C₁₃H₁₈F₃N₃
MW: 273.3 g/mol

VQ-023514

Need a price, a spec or a custom compound?

Send us your list — product names or CAS numbers, grade, quantity and destination. Our team replies with a formal quotation, COA and lead time.

Request a quote Contact sales