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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.

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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

Dimethyl 2-(2-(5-benzoyl-2,3-dibromo-1H-pyrrol-1-yl)ethyl)malonate

Dimethyl 2-(2-(5-benzoyl-2,3-dibromo-1H-pyrrol-1-yl)ethyl)malonate

CAS: 80965-18-0
Formula: C₁₈H₁₇Br₂NO₅
MW: 487.14 g/mol

VQ-031388

Reference Standard

Dimethyl 2-(3-methylbutylidene)malonate chemical structure

Dimethyl 2-(3-methylbutylidene)malonate

CAS: 53618-21-6
Formula: C₁₀H₁₆O₄
MW: 200.23 g/mol

VQ-041641

Reference Standard

Dimethyl 2-(4-(methoxycarbonyl)-2-nitrophenyl)malonate chemical structure

Dimethyl 2-(4-(methoxycarbonyl)-2-nitrophenyl)malonate

CAS: 1160293-27-5
Formula: C₁₃H₁₃NO₈
MW: 311.24 g/mol

VQ-023261

Reference Standard

Dimethyl 2-(4-bromophenyl)malonate chemical structure

Dimethyl 2-(4-bromophenyl)malonate

CAS: 149506-35-4
Formula: C₁₁H₁₁BrO₄
MW: 287.11 g/mol

VQ-038213

Reference Standard

Dimethyl 2-(4-nitro-1-oxoisoindolin-2-yl)pentanedioate chemical structure

Dimethyl 2-(4-nitro-1-oxoisoindolin-2-yl)pentanedioate

CAS: 827026-43-7
Formula: C₁₅H₁₆N₂O₇
MW: 336.3 g/mol

VQ-048828

Reference Standard

Dimethyl 2-(6-chloro-9H-carbazol-2-yl)-2-methylmalonate

Dimethyl 2-(6-chloro-9H-carbazol-2-yl)-2-methylmalonate

CAS: 1808312-15-3
Formula: C₁₈H₁₆ClNO₄
MW: 345.8 g/mol

VQ-029663

Reference Standard

Dimethyl 2-[2-(2-amino-6-chloropurin-9-yl)ethyl]malonate chemical structure

Dimethyl 2-[2-(2-amino-6-chloropurin-9-yl)ethyl]malonate

CAS: 172529-93-0
Formula: C₁₂H₁₄ClN₅O₄
MW: 327.72 g/mol

VQ-033092

Reference Standard

Dimethyl 2,2'-(4-isobutoxy-1,3-phenylene)bis(4-methylthiazole-5-carboxylate) chemical structure

Dimethyl 2,2'-(4-isobutoxy-1,3-phenylene)bis(4-methylthiazole-5-carboxylate)

CAS: 1330632-47-7
Formula: C₂₂H₂₄N₂O₅S₂
MW: 460.6 g/mol

VQ-030692

Reference Standard

Dimethyl 2,2'-disulfanediylbis(3-(4-(2-(5-ethylpyridin-2-yl)ethoxy)phenyl)propanoate) chemical structure

Dimethyl 2,2'-disulfanediylbis(3-(4-(2-(5-ethylpyridin-2-yl)ethoxy)phenyl)propanoate)

CAS: 1333112-32-5
Formula: C₃₈H₄₄N₂O₆S₂
MW: 688.9 g/mol

VQ-041499

Reference Standard

Dimethyl 2,6-dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate chemical structure

Dimethyl 2,6-dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate

CAS: 76258-20-3
Formula: C₁₇H₁₆N₂O₆
MW: 344.32 g/mol

VQ-032121

Reference Standard

Dimethyl 2,6-dimethyl-4-phenylpyridine-3,5-dicarboxylate chemical structure

Dimethyl 2,6-dimethyl-4-phenylpyridine-3,5-dicarboxylate

CAS: 77234-00-5
Formula: C₁₇H₁₇NO₄
MW: 299.32 g/mol

VQ-044002

Reference Standard

Dimethyl 3-(4-chlorophenyl)pentanedioate chemical structure

Dimethyl 3-(4-chlorophenyl)pentanedioate

CAS: 137310-15-7
Formula: C₁₃H₁₅ClO₄
MW: 270.71 g/mol

VQ-024487

Reference Standard

Dimethyl 3-methylthiophene-2,5-dicarboxylate

Dimethyl 3-methylthiophene-2,5-dicarboxylate

CAS: 63762-45-8
Formula: C₉H₁₀O₄S
MW: 214.24 g/mol

VQ-038161

Reference Standard

Dimethyl 4-hydroxy-4-methyl-2-(3-nitrophenyl)-6-oxocyclohexane-1,3-dicarboxylate chemical structure

Dimethyl 4-hydroxy-4-methyl-2-(3-nitrophenyl)-6-oxocyclohexane-1,3-dicarboxylate

CAS: 142592-09-4
Formula: C₁₇H₁₉NO₈
MW: 365.3 g/mol

VQ-043804

Reference Standard

Dimethyl 8-hydroxy-2,2,14,14-tetramethylpentadecanedioate chemical structure

Dimethyl 8-hydroxy-2,2,14,14-tetramethylpentadecanedioate

CAS: 2511500-14-2
Formula: C₂₁H₄₀O₅
MW: 372.5 g/mol

VQ-021753

Reference Standard

Dimethyl Azelate chemical structure

Dimethyl Azelate

CAS: 1732-10-1
Formula: C₁₁H₂₀O₄
MW: 216.27 g/mol

VQ-027210

Reference Standard

Dimethyl chlorothionophosphate chemical structure

Dimethyl chlorothionophosphate

CAS: 2524-03-0
Formula: C₂H₆ClO₂PS
MW: 160.56 g/mol

VQ-051069

Reference Standard

Dimethyl Fumarate-d6 chemical structure

Dimethyl Fumarate-d6

CAS: 66487-95-4
Formula: C₆H₈O₄
MW: 150.16 g/mol

VQ-041155

Reference Standard

Dimethyl Fumarate-d8

Dimethyl Fumarate-d8

CAS: 1616345-47-1
Formula: C₆D₈O₄
MW: 152.17 g/mol

VQ-048028

Reference Standard

Dimethyl Maleate chemical structure

Dimethyl Maleate

CAS: 624-48-6
Formula: C₆H₈O₄
MW: 144.12 g/mol

VQ-027135

Reference Standard

Dimethyl mesoxalate oxime chemical structure

Dimethyl mesoxalate oxime

CAS: 42937-74-6
Formula: C₅H₇NO₅
MW: 161.11 g/mol

VQ-051047

Reference Standard

Dimethyl N-Cyanodithiocarbonimidate chemical structure

Dimethyl N-Cyanodithiocarbonimidate

CAS: 10191-60-3
Formula: C₄H₆N₂S₂
MW: 146.2 g/mol

VQ-039186

Reference Standard

Dimethyl Phthalate-3,4,5,6 D4 chemical structure

Dimethyl Phthalate-3,4,5,6 D4

CAS: 93951-89-4
Formula: C₁₀H₁₀O₄
MW: 198.21 g/mol

VQ-041214

Reference Standard

Dimethyl Sulfate D6 chemical structure

Dimethyl Sulfate D6

CAS: 15199-43-6
Formula: C₂H₆O₄S
MW: 132.17 g/mol

VQ-041142

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