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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-Chloro-2-Fluoronitrobenzene chemical structure

4-Chloro-2-Fluoronitrobenzene

CAS: 700-37-8
Formula: C₆H₃ClFNO₂
MW: 175.54 g/mol

VQ-043994

Reference Standard

4-Chloro-2-Formyl-Benzoic Acid chemical structure

4-Chloro-2-Formyl-Benzoic Acid

CAS: 4657-56-1
Formula: C₈H₅ClO₃
MW: 184.57 g/mol

VQ-023415

Reference Standard

4-Chloro-2-hydroxy-5-sulfamoylbenzoic Acid chemical structure

4-Chloro-2-hydroxy-5-sulfamoylbenzoic Acid

CAS: 14556-98-0
Formula: C₇H₆ClNO₅S
MW: 251.64 g/mol

VQ-034713

Reference Standard

4-Chloro-2-nitrobenzoic acid chemical structure

4-Chloro-2-nitrobenzoic acid

CAS: 6280-88-2
Formula: C₇H₄ClNO₄
MW: 201.56 g/mol

VQ-036501

Reference Standard

4-Chloro-2-nitrophenylacetic Acid chemical structure

4-Chloro-2-nitrophenylacetic Acid

CAS: 37777-71-2
Formula: C₈H₆ClNO₄
MW: 215.59 g/mol

VQ-028787

Reference Standard

4-Chloro-2,3-dimethylpyridine N-Oxide chemical structure

4-Chloro-2,3-dimethylpyridine N-Oxide

CAS: 59886-90-7
Formula: C₇H₈ClNO
MW: 157.6 g/mol

VQ-041810

Reference Standard

4-Chloro-2,6-dinitroaniline chemical structure

4-Chloro-2,6-dinitroaniline

CAS: 5388-62-5
Formula: C₆H₄ClN₃O₄
MW: 217.57 g/mol

VQ-050084

Reference Standard

4-Chloro-3-(2-chloro-1-hydroxyethyl)phenol chemical structure

4-Chloro-3-(2-chloro-1-hydroxyethyl)phenol

CAS: 2353261-33-1
Formula: C₈H₈Cl₂O₂
MW: 207.05 g/mol

VQ-023698

Reference Standard

4-Chloro-3-(4-ethoxybenzyl)phenol chemical structure

4-Chloro-3-(4-ethoxybenzyl)phenol

CAS: 1408077-50-8
Formula: C₁₅H₁₅ClO₂
MW: 262.73 g/mol

VQ-036520

Reference Standard

4-Chloro-3-(chlorosulfonyl)benzoic Acid chemical structure

4-Chloro-3-(chlorosulfonyl)benzoic Acid

CAS: 2494-79-3
Formula: C₇H₄Cl₂O₄S
MW: 255.07 g/mol

VQ-037697

Reference Standard

4-Chloro-3-(ethoxysulfonyl)benzoic Acid chemical structure

4-Chloro-3-(ethoxysulfonyl)benzoic Acid

CAS: 604787-44-2
Formula: C₉H₉ClO₅S
MW: 264.68 g/mol

VQ-044236

Reference Standard

4-Chloro-3-(pyridin-2-yl)benzenamine chemical structure

4-Chloro-3-(pyridin-2-yl)benzenamine

CAS: 879088-41-2
Formula: C₁₁H₉ClN₂
MW: 204.65 g/mol

VQ-028720

Reference Standard

4-Chloro-3-(trifluoromethyl)benzenesulfonyl chloride chemical structure

4-Chloro-3-(trifluoromethyl)benzenesulfonyl chloride

CAS: 32333-53-2
Formula: C₇H₃Cl₂F₃O₂S
MW: 279.06 g/mol

VQ-050461

Reference Standard

4-Chloro-3-hydroxybutanenitrile chemical structure

4-Chloro-3-hydroxybutanenitrile

CAS: 105-33-9
Formula: C₄H₆ClNO
MW: 119.55 g/mol

VQ-039574

Reference Standard

4-Chloro-3-methoxy-2-methyl-pyridine hydrochloride chemical structure

4-Chloro-3-methoxy-2-methyl-pyridine hydrochloride

CAS: 1951439-74-9
Formula: C₇H₉Cl₂NO
MW: 194.06 g/mol

VQ-041324

Reference Standard

4-Chloro-3-methoxy-2-methylpyridine N-oxide chemical structure

4-Chloro-3-methoxy-2-methylpyridine N-oxide

CAS: 122307-41-9
Formula: C₇H₈ClNO₂
MW: 173.6 g/mol

VQ-041321

Reference Standard

4-Chloro-3-methoxyaniline chemical structure

4-Chloro-3-methoxyaniline

CAS: 13726-14-2
Formula: C₇H₈ClNO
MW: 157.6 g/mol

VQ-039081

Reference Standard

4-Chloro-3-nitro-5-sulfamoylbenzoic Acid chemical structure

4-Chloro-3-nitro-5-sulfamoylbenzoic Acid

CAS: 22892-96-2
Formula: C₇H₅ClN₂O₆S
MW: 280.64 g/mol

VQ-029534

Reference Standard

4-Chloro-3-nitrobenzoic acid methyl ester chemical structure

4-Chloro-3-nitrobenzoic acid methyl ester

CAS: 14719-83-6
Formula: C₈H₆ClNO₄
MW: 215.59 g/mol

VQ-026914

Reference Standard

4-Chloro-3-pyridazinecarboxylic acid chemical structure

4-Chloro-3-pyridazinecarboxylic acid

CAS: 1261798-87-1
Formula: C₅H₃ClN₂O₂
MW: 158.54 g/mol

VQ-036644

Reference Standard

4-Chloro-3-sulfamoylbenzoyl Chloride chemical structure

4-Chloro-3-sulfamoylbenzoyl Chloride

CAS: 70049-77-3
Formula: C₇H₅Cl₂NO₃S
MW: 254.09 g/mol

VQ-031197

Reference Standard

4-Chloro-4-fluorobutyrophenone chemical structure

4-Chloro-4-fluorobutyrophenone

CAS: 3874-54-2
Formula: C₁₀H₁₀ClFO
MW: 200.64 g/mol

VQ-026044

Reference Standard

4-Chloro-4-methyl-5-methylene-1,3-dioxolan-2-one chemical structure

4-Chloro-4-methyl-5-methylene-1,3-dioxolan-2-one

CAS: 95579-71-8
Formula: C₅H₅ClO₃
MW: 148.54 g/mol

VQ-026994

Reference Standard

4-Chloro-4′-methoxybenzophenone chemical structure

4-Chloro-4′-methoxybenzophenone

CAS: 10547-60-1
Formula: C₁₄H₁₁ClO₂
MW: 246.69 g/mol

VQ-030697

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