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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-Hydroxy-2-methylbenzenesulfonic Acid chemical structure

4-Hydroxy-2-methylbenzenesulfonic Acid

CAS: 7134-05-6
Formula: C₇H₈O₄S
MW: 188.2 g/mol

VQ-041546

Reference Standard

4-Hydroxy-3-iodobenzoic acid chemical structure

4-Hydroxy-3-iodobenzoic acid

CAS: 37470-46-5
Formula: C₇H₅IO₃
MW: 264.02 g/mol

VQ-051922

Reference Standard

4-Hydroxy-3-methoxy-2-nitrobenzaldehyde chemical structure

4-Hydroxy-3-methoxy-2-nitrobenzaldehyde

CAS: 2450-26-2
Formula: C₈H₇NO₅
MW: 197.14 g/mol

VQ-032544

Reference Standard

4-Hydroxy-3-methoxybenzenesulfonic Acid chemical structure

4-Hydroxy-3-methoxybenzenesulfonic Acid

CAS: 7134-11-4
Formula: C₇H₈O₅S
MW: 204.2 g/mol

VQ-043187

Reference Standard

4-Hydroxy-3-methoxyphenylacetone chemical structure

4-Hydroxy-3-methoxyphenylacetone

CAS: 2503-46-0
Formula: C₁₀H₁₂O₃
MW: 180.2 g/mol

VQ-050509

Reference Standard

4-Hydroxy-3-nitrobenzonitrile chemical structure

4-Hydroxy-3-nitrobenzonitrile

CAS: 3272-08-0
Formula: C₇H₄N₂O₃
MW: 164.12 g/mol

VQ-032195

Reference Standard

4-Hydroxy-3-pyridinesulfonic Acid chemical structure

4-Hydroxy-3-pyridinesulfonic Acid

CAS: 51498-37-4
Formula: C₅H₅NO₄S
MW: 175.16 g/mol

VQ-040056

Reference Standard

4-Hydroxy-3,5-diiodobenzoic Acid chemical structure

4-Hydroxy-3,5-diiodobenzoic Acid

CAS: 618-76-8
Formula: C₇H₄I₂O₃
MW: 389.91 g/mol

VQ-049785

Reference Standard

4-Hydroxy-3,5-dipropylbenzoic acid chemical structure

4-Hydroxy-3,5-dipropylbenzoic acid

CAS: 100482-27-7
Formula: C₁₃H₁₈O₃
MW: 222.28 g/mol

VQ-041737

Reference Standard

4-Hydroxy-4-(6-methoxynaphthalen-2-yl)but-3-en-2-one chemical structure

4-Hydroxy-4-(6-methoxynaphthalen-2-yl)but-3-en-2-one

CAS: 73356-31-7
Formula: C₁₅H₁₄O₃
MW: 242.27 g/mol

VQ-026812

Reference Standard

4-Hydroxy-4'-methylbenzophenone chemical structure

4-Hydroxy-4'-methylbenzophenone

CAS: 134-92-9
Formula: C₁₄H₁₂O₂
MW: 212.24 g/mol

VQ-029111

Reference Standard

4-Hydroxy-5-methoxy-2-nitrobenzaldehyde chemical structure

4-Hydroxy-5-methoxy-2-nitrobenzaldehyde

CAS: 2454-72-0
Formula: C₈H₇NO₅
MW: 197.14 g/mol

VQ-039297

Reference Standard

4-Hydroxy-5-methylpyridin-2(1H)-one chemical structure

4-Hydroxy-5-methylpyridin-2(1H)-one

CAS: 41935-71-1
Formula: C₆H₇NO₂
MW: 125.13 g/mol

VQ-037276

Reference Standard

4-Hydroxy-6-methyl-2-pyrone chemical structure

4-Hydroxy-6-methyl-2-pyrone

CAS: 675-10-5
Formula: C₆H₆O₃
MW: 126.11 g/mol

VQ-042278

Reference Standard

4-Hydroxy-6-methylbenzene-1,3-disulfonic Acid chemical structure

4-Hydroxy-6-methylbenzene-1,3-disulfonic Acid

CAS: 15509-33-8
Formula: C₇H₈O₇S₂
MW: 268.3 g/mol

VQ-038859

Reference Standard

4-Hydroxy-6-methylbenzene-1,3-disulfonic Acid Diammonia Salt chemical structure

4-Hydroxy-6-methylbenzene-1,3-disulfonic Acid Diammonia Salt

CAS: 2702366-48-9
Formula: C₇H₁₁NO₄S
MW: 205.23 g/mol

VQ-040328

Reference Standard

4-Hydroxy-6,7-dimethoxyqunioline chemical structure

4-Hydroxy-6,7-dimethoxyqunioline

CAS: 13425-93-9
Formula: C₁₁H₁₁NO₃
MW: 205.21 g/mol

VQ-021037

Reference Standard

4-Hydroxy-7-methoxy-6-quinolinecarboxamide chemical structure

4-Hydroxy-7-methoxy-6-quinolinecarboxamide

CAS: 2110414-05-4
Formula: C₁₁H₁₀N₂O₃
MW: 218.21 g/mol

VQ-021254

Reference Standard

4-Hydroxy-9-cis-retinoic Acid chemical structure

4-Hydroxy-9-cis-retinoic Acid

CAS: 150737-17-0
Formula: C₂₀H₂₈O₃
MW: 316.4 g/mol

VQ-031290

Reference Standard

4-Hydroxy-bz-gly-oh chemical structure

4-Hydroxy-bz-gly-oh

CAS: 2482-25-9
Formula: C₉H₉NO₄
MW: 195.17 g/mol

VQ-031062

Reference Standard

4-Hydroxy-L-(+)-2-phenylglycine chemical structure

4-Hydroxy-L-(+)-2-phenylglycine

CAS: 32462-30-9
Formula: C₈H₉NO₃
MW: 167.16 g/mol

VQ-039822

Reference Standard

4-Hydroxy-L-isoleucine chemical structure

4-Hydroxy-L-isoleucine

CAS: 781658-23-9
Formula: C₆H₁₃NO₃
MW: 147.17 g/mol

VQ-032412

Reference Standard

4-Hydroxy-N-desbutyl Bupivacaine chemical structure

4-Hydroxy-N-desbutyl Bupivacaine

CAS: 51989-48-1
Formula: C₁₄H₂₀N₂O₂
MW: 248.32 g/mol

VQ-024683

Reference Standard

4-Hydroxy-N-Desmethyl Tamoxifen chemical structure

4-Hydroxy-N-Desmethyl Tamoxifen

CAS: 112093-28-4
Formula: C₂₅H₂₇NO₂
MW: 373.5 g/mol

VQ-034366

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