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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.

27,990products

6sub-categories

2,746in stock

COA + SDSwith every lot

API Impurities 14,098 Pharmacopeial Impurities (EP / USP / BP) 4,399 Nitrosamine Impurities 631 Stable Isotope Labelled Standards (Deuterated, 13C, 15N) 1,504 Metabolites & Degradation Products 3,922 API Reference Standards 3,436

Reference Standard

α-(2,3-Dimethylphenyl)-1-(trityl)-1H-imidazole-4-methanol chemical structure

α-(2,3-Dimethylphenyl)-1-(trityl)-1H-imidazole-4-methanol

CAS: 176721-01-0
Formula: C₃₁H₂₈N₂O
MW: 444.6 g/mol

VQ-026583

Reference Standard

α-[[[2-(4-Methoxyphenyl)-1-methylethyl](phenylmethyl)amino]methyl]-3-nitro-4-(phenylmethoxy)benzenemethanol chemical structure

α-[[[2-(4-Methoxyphenyl)-1-methylethyl](phenylmethyl)amino]methyl]-3-nitro-4-(phenylmethoxy)benzenemethanol

CAS: 43229-67-0
Formula: C₃₂H₃₄N₂O₅
MW: 526.6 g/mol

VQ-037419

Reference Standard

α-Bisabolol Oxide B chemical structure

α-Bisabolol Oxide B

CAS: 26184-88-3
Formula: C₁₅H₂₆O₂
MW: 238.37 g/mol

VQ-044684

Reference Standard

α-Chloro-2',5'-dihydroxyacetophenone chemical structure

α-Chloro-2',5'-dihydroxyacetophenone

CAS: 60912-82-5
Formula: C₈H₇ClO₃
MW: 186.59 g/mol

VQ-031273

Reference Standard

α-Decitabine-3',5'-bis(4-chlorobenzoate) chemical structure

α-Decitabine-3',5'-bis(4-chlorobenzoate)

CAS: 1140891-02-6
Formula: C₂₂H₁₈Cl₂N₄O₆
MW: 505.3 g/mol

VQ-022319

Reference Standard

α-Dihydroartemisinin chemical structure

α-Dihydroartemisinin

CAS: 81496-81-3
Formula: C₁₅H₂₄O₅
MW: 284.35 g/mol

VQ-029221

Reference Standard

α-Ethyl Norepinephrine Hydrochloride chemical structure

α-Ethyl Norepinephrine Hydrochloride

CAS: 3198-07-0
Formula: C₁₀H₁₆ClNO₃
MW: 233.69 g/mol

VQ-038686

Reference Standard

α-Ethyl-3,4-dimethoxy-Benzeneacetonitrile chemical structure

α-Ethyl-3,4-dimethoxy-Benzeneacetonitrile

CAS: 39066-05-2
Formula: C₁₂H₁₅NO₂
MW: 205.25 g/mol

VQ-034587

Reference Standard

α-Formyl-(3-endo)-8-methyl-8-azabicyclo[3.2.1]oct-3-yl benzeneacetic Acidester chemical structure

α-Formyl-(3-endo)-8-methyl-8-azabicyclo[3.2.1]oct-3-yl benzeneacetic Acidester

CAS: 22226-37-5
Formula: C₁₇H₂₁NO₃
MW: 287.35 g/mol

VQ-026090

Reference Standard

α-Hydroxy-4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodo-N-methyl-benzeneacetamide chemical structure

α-Hydroxy-4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodo-N-methyl-benzeneacetamide

CAS: 2088032-68-0
Formula: C₁₅H₁₁I₄NO₄
MW: 776.87 g/mol

VQ-043210

Reference Standard

α-Hydroxy-α-3-thienyl-2-thiopheneacetic Acid 9-Methyl-3-oxa-9-azatricyclo[3.3.1.02,4]non-7-yl Ester chemical structure

α-Hydroxy-α-3-thienyl-2-thiopheneacetic Acid 9-Methyl-3-oxa-9-azatricyclo[3.3.1.02,4]non-7-yl Ester

CAS: 783273-13-2
Formula: C₁₈H₁₉NO₄S₂
MW: 377.5 g/mol

VQ-044521

Reference Standard

α-Phenyl-α-(2-propyn-1-yloxy)benzeneacetic Acid chemical structure

α-Phenyl-α-(2-propyn-1-yloxy)benzeneacetic Acid

CAS: 2766-01-0
Formula: C₁₇H₁₄O₃
MW: 266.29 g/mol

VQ-034460

Reference Standard

α,α-Diisopropylhomoveratronitrile chemical structure

α,α-Diisopropylhomoveratronitrile

CAS: 51698-54-5
Formula: C₁₆H₂₃NO₂
MW: 261.36 g/mol

VQ-028680

Reference Standard

α,α-Diphenyl-γ-butyrolactone chemical structure

α,α-Diphenyl-γ-butyrolactone

CAS: 956-89-8
Formula: C₁₆H₁₄O₂
MW: 238.28 g/mol

VQ-048926

Reference Standard

α,α,α',5-Tetramethyl-1,3-benzenediacetonitrile chemical structure

α,α,α',5-Tetramethyl-1,3-benzenediacetonitrile

CAS: 120512-38-1
Formula: C₁₄H₁₆N₂
MW: 212.29 g/mol

VQ-035737

Reference Standard

β- Hydroxy- Dextromethorphan chemical structure

β- Hydroxy- Dextromethorphan

CAS: 120442-81-1
Formula: C₁₈H₂₅NO₂
MW: 287.4 g/mol

VQ-043137

Reference Standard

β-Apo-8-carotenal chemical structure

β-Apo-8-carotenal

CAS: 1107-26-2
Formula: C₃₀H₄₀O
MW: 416.6 g/mol

VQ-032532

Reference Standard

β-Boswellic Acid chemical structure

β-Boswellic Acid

CAS: 631-69-6
Formula: C₃₀H₄₈O₃
MW: 456.7 g/mol

VQ-027127

Reference Standard

β-Cholestanol chemical structure

CAS: 80-97-7
Formula: C₂₇H₄₈O
MW: 388.7 g/mol

VQ-024953

Reference Standard

β-Estradiol 17-Acetate chemical structure

β-Estradiol 17-Acetate

CAS: 1743-60-8
Formula: C₂₀H₂₆O₃
MW: 314.4 g/mol

VQ-030595

Reference Standard

β-Hydroxy Thyroxine chemical structure

β-Hydroxy Thyroxine

CAS: 107849-54-7
Formula: C₁₅H₁₁I₄NO₅
MW: 792.87 g/mol

VQ-034858

Reference Standard

β-Lumi (-)-Colchicine chemical structure

β-Lumi (-)-Colchicine

CAS: 6901-13-9
Formula: C₂₂H₂₅NO₆
MW: 399.4 g/mol

VQ-022256

Reference Standard

β-Muricholic Acid-[d5]

β-Muricholic Acid-[d5]

CAS: 2725726-62-3
Formula: C₂₄H₃₅D₅O₅
MW: 413.6 g/mol

VQ-036238

Reference Standard

β-Pinene chemical structure

CAS: 127-91-3
Formula: C₁₀H₁₆
MW: 136.23 g/mol

VQ-036101

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