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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-Formyl-2-methoxyphenyl acetate chemical structure

4-Formyl-2-methoxyphenyl acetate

CAS: 881-68-5
Formula: C₁₀H₁₀O₄
MW: 194.18 g/mol

VQ-043562

Reference Standard

4-Formyl-3-hydroxybenzonitrile chemical structure

4-Formyl-3-hydroxybenzonitrile

CAS: 84102-89-6
Formula: C₈H₅NO₂
MW: 147.13 g/mol

VQ-030738

Reference Standard

4-Formyl-3-methoxybenzamide chemical structure

4-Formyl-3-methoxybenzamide

CAS: 1289153-30-5
Formula: C₉H₉NO₃
MW: 179.17 g/mol

VQ-048385

Reference Standard

4-Formylphenyl methanesulfonate chemical structure

4-Formylphenyl methanesulfonate

CAS: 69088-97-7
Formula: C₈H₈O₄S
MW: 200.21 g/mol

VQ-041496

Reference Standard

4-Formylphthalonitrile chemical structure

4-Formylphthalonitrile

CAS: 313228-48-7
Formula: C₉H₄N₂O
MW: 156.14 g/mol

VQ-032650

Reference Standard

4-Guanidino-N-((6-hydroxynaphthalen-2-yl)(imino)methyl)benzamide chemical structure

4-Guanidino-N-((6-hydroxynaphthalen-2-yl)(imino)methyl)benzamide

CAS: 97457-78-8
Formula: C₁₉H₁₇N₅O₂
MW: 347.4 g/mol

VQ-038539

Reference Standard

4-Hydrazino Benzene Sulfonamide Hydrochloride chemical structure

4-Hydrazino Benzene Sulfonamide Hydrochloride

CAS: 27918-19-0
Formula: C₆H₁₀ClN₃O₂S
MW: 223.68 g/mol

VQ-032458

Reference Standard

4-Hydrazino-benzamide hydrochloride chemical structure

4-Hydrazino-benzamide hydrochloride

CAS: 40566-97-0
Formula: C₇H₁₀ClN₃O
MW: 187.63 g/mol

VQ-039739

Reference Standard

4-Hydrazino-benzoic acid ethyl ester chemical structure

4-Hydrazino-benzoic acid ethyl ester

CAS: 14685-90-6
Formula: C₉H₁₂N₂O₂
MW: 180.2 g/mol

VQ-049624

Reference Standard

4-Hydrazinobenzoic Acid-d4 Hydrochloride chemical structure

4-Hydrazinobenzoic Acid-d4 Hydrochloride

CAS: 1246816-67-0
Formula: C₇H₉ClN₂O₂
MW: 192.63 g/mol

VQ-052470

Reference Standard

4-Hydrazinyl-1-methylazepane chemical structure

4-Hydrazinyl-1-methylazepane

CAS: 110406-95-6
Formula: C₇H₁₇N₃
MW: 143.23 g/mol

VQ-029330

Reference Standard

4-Hydrazinyl-1-methylazepane Dihydrochloride chemical structure

4-Hydrazinyl-1-methylazepane Dihydrochloride

CAS: 169123-29-9
Formula: C₇H₂₀Cl₃N₃
MW: 252.6 g/mol

VQ-045100

Reference Standard

4-Hydroxy Alverine chemical structure

4-Hydroxy Alverine

CAS: 142047-94-7
Formula: C₂₀H₂₇NO
MW: 297.4 g/mol

VQ-021366

Reference Standard

4-Hydroxy Alverine Hydrochloride

4-Hydroxy Alverine Hydrochloride

CAS: 142047-93-6
Formula: C₂₀H₂₈ClNO
MW: 333.9 g/mol

VQ-035667

Reference Standard

4-Hydroxy Alverine-d5 chemical structure

4-Hydroxy Alverine-d5

CAS: 1216415-67-6
Formula: C₂₀H₂₇NO
MW: 302.5 g/mol

VQ-043409

Reference Standard

4-Hydroxy Antipyrine chemical structure

4-Hydroxy Antipyrine

CAS: 1672-63-5
Formula: C₁₁H₁₂N₂O₂
MW: 204.22 g/mol

VQ-027115

Reference Standard

4-Hydroxy Atorvastatin Disodium Salt chemical structure

4-Hydroxy Atorvastatin Disodium Salt

CAS: 1276537-18-8
Formula: C₃₃H₃₃FN₂Na₂O₆
MW: 618.6 g/mol

VQ-029253

Reference Standard

4-Hydroxy Atorvastatin Hemicalcium Salt chemical structure

4-Hydroxy Atorvastatin Hemicalcium Salt

CAS: 1263176-34-6
Formula: C₃₃H₃₄CaFN₂O₆⁺
MW: 613.7 g/mol

VQ-024401

Reference Standard

4-Hydroxy Atorvastatin Lactone chemical structure

4-Hydroxy Atorvastatin Lactone

CAS: 163217-70-7
Formula: C₃₃H₃₃FN₂O₅
MW: 556.6 g/mol

VQ-021657

Reference Standard

4-Hydroxy Benzeneacetic Acid 2-(Dimethylamino)-2-oxoethyl Ester chemical structure

4-Hydroxy Benzeneacetic Acid 2-(Dimethylamino)-2-oxoethyl Ester

CAS: 59721-16-3
Formula: C₁₂H₁₅NO₄
MW: 237.25 g/mol

VQ-043089

Reference Standard

4-Hydroxy Benzothioamide chemical structure

4-Hydroxy Benzothioamide

CAS: 25984-63-8
Formula: C₇H₇NOS
MW: 153.2 g/mol

VQ-032387

Reference Standard

4-Hydroxy Clonidine chemical structure

4-Hydroxy Clonidine

CAS: 57101-48-1
Formula: C₉H₉Cl₂N₃O
MW: 246.09 g/mol

VQ-029873

Reference Standard

4-Hydroxy Diclofenac chemical structure

4-Hydroxy Diclofenac

CAS: 64118-84-9
Formula: C₁₄H₁₁Cl₂NO₃
MW: 312.1 g/mol

VQ-021411

Reference Standard

4-Hydroxy Diclofenac-d4 chemical structure

4-Hydroxy Diclofenac-d4

CAS: 254762-27-1
Formula: C₁₄H₁₁Cl₂NO₃
MW: 316.2 g/mol

VQ-036679

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