Febuxostat Related Compounds & Impurities

Febuxostat is a selective xanthine oxidase inhibitor that reduces serum urate levels, used for chronic gout and hyperuricaemia management.

Simson Pharma Limited along with its subsidiary offices Simson Pharma Global Ltd. (UK) and Simson Pharma Global LLC (USA) is a trusted manufacturer and supplier of high-quality pharmaceutical reference standards, offering a comprehensive portfolio of Febuxostat reference standards, pharmacopeial and non-pharmacopeial Febuxostat impurities, related compounds, related substances, metabolites, stable isotope-labelled compounds, deuterium labelled compounds and nitrosamine (N-NO) reference standards.

These materials support pharmaceutical research and development, product development, ANDA and DMF submissions, quality control (QC), analytical method development and validation, stability studies, impurity identification, and genotoxic impurity assessment.

Our Febuxostat-related reference standards are thoroughly characterized using advanced analytical techniques and are supplied with comprehensive Certificates of Analysis (COA) and supporting analytical data from our USFDA certified, ISO 17025 and ISO 17034 accredited Lab, to meet global regulatory expectations. EP and USP traceable reference standards can also be provided upon request, subject to availability. Simson is also a provider of EP and USP traceable standards. To ensure consistent quality and reliability, our reference standards are periodically re-tested according to established quality management procedures.

Pharmaceutical Reference Standards / Impurity Standards

Febuxostat
Febuxostat
  • CAT. No.F180000
  • CAS. No.144060-53-7
  • Mol. F.C16H16N2O3S
  • Mol. W.316.37 g/mol
  • Stock Status:Instock
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Febuxostat (Form G)
Febuxostat (Form G)
  • CAT. No.F180000B
  • CAS. No.NA
  • Mol. F.C16H16N2O3S
  • Mol. W.316.37 g/mol
  • Stock Status:Instock
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3-Cyano-4-isobutyloxythiobenzamide
3-Cyano-4-isobutyloxythiobenzamide
  • CAT. No.F180002
  • CAS. No.163597-57-7
  • Mol. F.C12H14N2OS
  • Mol. W.234.32 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 1
Febuxostat Impurity 1
  • CAT. No.F180003
  • CAS. No.161798-01-2
  • Mol. F.C14H13NO4S
  • Mol. W.291.32 g/mol
  • Stock Status:Instock
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ethyl 2,4-dimethylthiazole-5-carboxylate
ethyl 2,4-dimethylthiazole-5-carboxylate
  • CAT. No.F180004
  • CAS. No.7210-77-7
  • Mol. F.C8H11NO2S
  • Mol. W.185.24 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Bromo Impurity
Febuxostat Bromo Impurity
  • CAT. No.F180005
  • CAS. No.144060-40-2
  • Mol. F.C15H16BrNO3S
  • Mol. W.370.26 g/mol
  • Stock Status:Instock
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Febuxostat Des Cyano Hydroxy Impurity
Febuxostat Des Cyano Hydroxy Impurity
  • CAT. No.F180006
  • CAS. No.NA
  • Mol. F.C11H9NO3S
  • Mol. W.235.26 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Hydroxy Impurity
Febuxostat Hydroxy Impurity
  • CAT. No.F180007
  • CAS. No.NA
  • Mol. F.NA
  • Mol. W.NA
  • Stock Status:Custom Synthesis
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Febuxostat n-butyl Isomer
Febuxostat n-butyl Isomer
  • CAT. No.F180008
  • CAS. No.1657014-33-9
  • Mol. F.C16H16N2O3S
  • Mol. W.316.37 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat 2-butanol isomer
Febuxostat 2-butanol isomer
  • CAT. No.F180009
  • CAS. No.1335202-59-9
  • Mol. F.C16H16N2O3S
  • Mol. W.316.38 g/mol
  • Stock Status:Instock
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Febuxostat Isopropyl Isomer
Febuxostat Isopropyl Isomer
  • CAT. No.F180010
  • CAS. No.144060-52-6
  • Mol. F.C15H14N2O3S
  • Mol. W.302.35 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Descarboxy Impurity
Febuxostat Descarboxy Impurity
  • CAT. No.F180011
  • CAS. No.1335202-60-2
  • Mol. F.C15H16N2OS
  • Mol. W.272.37 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Acyl-beta-D-glucuronide
Febuxostat Acyl-beta-D-glucuronide
  • CAT. No.F180012
  • CAS. No.1351692-92-6
  • Mol. F.C22H24N2O9S
  • Mol. W.492.50 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Diacid impurity
Febuxostat Diacid impurity
  • CAT. No.F180014
  • CAS. No.1239233-87-4
  • Mol. F.C16H17NO5S
  • Mol. W.335.37 g/mol
  • Stock Status:Instock
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Febuxostat Amide Impurity
Febuxostat Amide Impurity
  • CAT. No.F180015
  • CAS. No.1239233-86-3
  • Mol. F.C16H18N2O4S
  • Mol. W.334.39 g/mol
  • Stock Status:Instock
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Febuxostat Ethyl Ester
Febuxostat Ethyl Ester
  • CAT. No.F180016
  • CAS. No.160844-75-7
  • Mol. F.C18H20N2O3S
  • Mol. W.344.43 g/mol
  • Stock Status:Instock
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Febuxostat Impurity 8
Febuxostat Impurity 8
  • CAT. No.F180017
  • CAS. No.144060-62-8
  • Mol. F.C16H17NO4S
  • Mol. W.319.38 g/mol
  • Stock Status:Instock
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Febuxostat Impurity 28
Febuxostat Impurity 28
  • CAT. No.F180018
  • CAS. No.1350352-70-3
  • Mol. F.C16H18N2O4S
  • Mol. W.334.39 g/mol
  • Stock Status:Instock
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Febuxostat Impurity 22
Febuxostat Impurity 22
  • CAT. No.F180019
  • CAS. No.NA
  • Mol. F.C16H16N2O3S
  • Mol. W.316.38 g/mol
  • Stock Status:Custom Synthesis
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Desisobutyl Febuxostat
Desisobutyl Febuxostat
  • CAT. No.F180020
  • CAS. No.407582-48-3
  • Mol. F.C12H8N2O3S
  • Mol. W.260.27 g/mol
  • Stock Status:Instock
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Febuxostat 4-Hydroxy Ethyl Ester
Febuxostat 4-Hydroxy Ethyl Ester
  • CAT. No.F180021
  • CAS. No.161798-02-3
  • Mol. F.C14H12N2O3S
  • Mol. W.288.32 g/mol
  • Stock Status:Instock
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Febuxostat Methyl Ester
Febuxostat Methyl Ester
  • CAT. No.F180022
  • CAS. No.923942-34-1
  • Mol. F.C17H18N2O3S
  • Mol. W.330.40 g/mol
  • Stock Status:Instock
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Febuxostat sec-Butoxy Acid
Febuxostat sec-Butoxy Acid
  • CAT. No.F180023
  • CAS. No.NA
  • Mol. F.C16H16N2O3S
  • Mol. W.316.38 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Tert-butoxy Acid
Febuxostat Tert-butoxy Acid
  • CAT. No.F180024
  • CAS. No.2418591-43-0
  • Mol. F.C16H16N2O3S
  • Mol. W.316.38 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 23
Febuxostat Impurity 23
  • CAT. No.F180025
  • CAS. No.NA
  • Mol. F.C22H24N2O5S2
  • Mol. W.460.56 g/mol
  • Stock Status:Custom Synthesis
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N-(1-cyanocyclopentyl)pentanamide
N-(1-cyanocyclopentyl)pentanamide
  • CAT. No.F180027
  • CAS. No.194984-24-2  
  • Mol. F.C11H18N2O
  • Mol. W.194.27 g/mol
  • Stock Status:Instock
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Febuxostat Hydroxy Ester Impurity
Febuxostat Hydroxy Ester Impurity
  • CAT. No.F180028
  • CAS. No.161797-99-5
  • Mol. F.C13H13NO3S
  • Mol. W.263.31 g/mol
  • Stock Status:Instock
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Descyano Febuxostat Ethyl Ester (Stage- I)
Descyano Febuxostat Ethyl Ester (Stage- I)
  • CAT. No.F180029
  • CAS. No.144060-97-9
  • Mol. F.C17H21NO3S
  • Mol. W.319.42 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat sec-Butoxy Acid
Febuxostat sec-Butoxy Acid
  • CAT. No.F180031
  • CAS. No.1335202-59-9
  • Mol. F.C16H16N2O3S
  • Mol. W.316.38 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Dithioamide impurity
Febuxostat Dithioamide impurity
  • CAT. No.F180032
  • CAS. No.1330632-46-6
  • Mol. F.C12H16N2OS2
  • Mol. W.268.40 g/mol
  • Stock Status:Custom Synthesis
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Dicyano Impurity
Dicyano Impurity
  • CAT. No.F180033
  • CAS. No.161718-81-6
  • Mol. F.C12H12N2O
  • Mol. W.200.24 g/mol
  • Stock Status:Custom Synthesis
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2, 4-Dicyanonitrobenzene
2, 4-Dicyanonitrobenzene
  • CAT. No.F180034
  • CAS. No.52054-41-8
  • Mol. F.C8H3N3O2
  • Mol. W.173.13 g/mol
  • Stock Status:Instock
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Febuxostat Descyano Ethyl Ester
Febuxostat Descyano Ethyl Ester
  • CAT. No.F180035
  • CAS. No.144060-97-9
  • Mol. F.C17H21NO3S
  • Mol. W.319.42 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat 4-Hydroxy Acid Impurity
Febuxostat 4-Hydroxy Acid Impurity
  • CAT. No.F180036
  • CAS. No.407582-48-3
  • Mol. F.C12H8N2O3S
  • Mol. W.260.27 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 2
Febuxostat Impurity 2
  • CAT. No.F180037
  • CAS. No.161798-03-4
  • Mol. F.C18H21NO4S
  • Mol. W.347.43 g/mol
  • Stock Status:Instock
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3-Descyano Febuxostat
3-Descyano Febuxostat
  • CAT. No.F180038
  • CAS. No.1206550-99-3
  • Mol. F.C15H17NO3S
  • Mol. W.291.37 g/mol
  • Stock Status:Instock
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O-Desisobutyl-O-n-propyl Febuxostat
O-Desisobutyl-O-n-propyl Febuxostat
  • CAT. No.F180039
  • CAS. No.1530308-87-2
  • Mol. F.C15H14N2O3S
  • Mol. W.302.35 g/mol
  • Stock Status:Instock
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Febuxostat FBXRC4
Febuxostat FBXRC4
  • CAT. No.F180040
  • CAS. No.NA
  • Mol. F.NA
  • Mol. W.NA
  • Stock Status:Custom Synthesis
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Febuxostat FBXRC5
Febuxostat FBXRC5
  • CAT. No.F180041
  • CAS. No.NA
  • Mol. F.NA
  • Mol. W.NA
  • Stock Status:Custom Synthesis
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Febuxostat Isopropyl Ester
Febuxostat Isopropyl Ester
  • CAT. No.F180043
  • CAS. No.1346238-10-5
  • Mol. F.C19H22N2O3S
  • Mol. W.358.46 g/mol
  • Stock Status:Instock
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4-butoxy-3-cyanobenzothioamide
4-butoxy-3-cyanobenzothioamide
  • CAT. No.F180044
  • CAS. No.NA
  • Mol. F.C12H14N2OS
  • Mol. W.234.32 g/mol
  • Stock Status:Custom Synthesis
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Ethyl 2-(4-Hydroxyphenyl)-4-methylthiazole-5-carboxylate Hydrochloride
Ethyl 2-(4-Hydroxyphenyl)-4-methylthiazole-5-carboxylate Hydrochloride
  • CAT. No.F180045
  • CAS. No.399017-10-8
  • Mol. F.C13H13NO3S.HCl
  • Mol. W.299.77 g/mol
  • Stock Status:Instock
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Febuxostat Impurity 6
Febuxostat Impurity 6
  • CAT. No.F180046
  • CAS. No.1271738-74-9
  • Mol. F.C18H22N2O4S
  • Mol. W.362.44 g/mol
  • Stock Status:Custom Synthesis
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2-[3-Cyano-4-(3-hydroxy-2-methylpropoxy)phenyl]-4-methyl-5-thiazolecarboxylic acid
2-[3-Cyano-4-(3-hydroxy-2-methylpropoxy)phenyl]-4-methyl-5-thiazolecarboxylic acid
  • CAT. No.F180047
  • CAS. No.887945-96-2
  • Mol. F.C16H16N2O4S
  • Mol. W.332.37 g/mol
  • Stock Status:Under Synthesis
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Febuxostat 67M-2
Febuxostat 67M-2
  • CAT. No.F180048
  • CAS. No.407582-47-2
  • Mol. F.C16H16N2O4S
  • Mol. W.332.37 g/mol
  • Stock Status:Under Synthesis
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2-[4-(2-Carboxypropoxy)-3-cyanophenyl]-4-methyl-5-thiazolecarboxylic Acid
2-[4-(2-Carboxypropoxy)-3-cyanophenyl]-4-methyl-5-thiazolecarboxylic Acid
  • CAT. No.F180049
  • CAS. No.407582-49-4
  • Mol. F.C16H14N2O5S
  • Mol. W.346.36 g/mol
  • Stock Status:Under Synthesis
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Ethyl 2-(2-hydroxyphenyl)-4-methylthiazole-5-carboxylate
Ethyl 2-(2-hydroxyphenyl)-4-methylthiazole-5-carboxylate
  • CAT. No.F180050
  • CAS. No.118485-48-6
  • Mol. F.C13H13NO3S
  • Mol. W.263.32 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat DEE Impurity
Febuxostat DEE Impurity
  • CAT. No.F180058
  • CAS. No.1643131-93-4
  • Mol. F.C20H25NO5S
  • Mol. W.391.48 g/mol
  • Stock Status:Instock
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Febuxostat sec-Butoxy Acid
Febuxostat sec-Butoxy Acid
  • CAT. No.F180059
  • CAS. No.1335202-59-9
  • Mol. F.C16H16N2O3S
  • Mol. W.316.38 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Diformyl impurity
Febuxostat Diformyl impurity
  • CAT. No.F180061
  • CAS. No.NA
  • Mol. F.C15H13NO5S
  • Mol. W.319.33 g/mol
  • Stock Status:Custom Synthesis
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2-(3-(ethoxycarbonyl)-4-isobutoxyphenyl)-4-methylthiazole-5-carboxylic acid
2-(3-(ethoxycarbonyl)-4-isobutoxyphenyl)-4-methylthiazole-5-carboxylic acid
  • CAT. No.F180062
  • CAS. No.NA
  • Mol. F.C18H21NO5S
  • Mol. W.363.43 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Isopropyl Isomer Ethyl Ester
Febuxostat Isopropyl Isomer Ethyl Ester
  • CAT. No.F180063
  • CAS. No.144060-84-4
  • Mol. F.C17H18N2O3S
  • Mol. W.330.40 g/mol
  • Stock Status:Custom Synthesis
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3-Descyano-3-ethoxycarbonyl Febuxostat
3-Descyano-3-ethoxycarbonyl Febuxostat
  • CAT. No.F180064
  • CAS. No.2476465-11-7
  • Mol. F.C18H21NO5S
  • Mol. W.363.43 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 26
Febuxostat Impurity 26
  • CAT. No.F180065
  • CAS. No.2230270-05-8
  • Mol. F.C18H20N2O3S
  • Mol. W.363.43 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Butyl Ester Impurity
Febuxostat Butyl Ester Impurity
  • CAT. No.F180066
  • CAS. No.1619982-02-3
  • Mol. F.C20H24N2O3S
  • Mol. W.372.48 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 38
Febuxostat Impurity 38
  • CAT. No.F180067
  • CAS. No.2476465-06-0
  • Mol. F.C17H19NO5S
  • Mol. W.349.40 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Form C
Febuxostat Form C
  • CAT. No.F180068
  • CAS. No.144060-53-7
  • Mol. F.C16H16N2O3S
  • Mol. W.316.37 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 3
Febuxostat Impurity 3
  • CAT. No.F180069
  • CAS. No.1330632-47-7
  • Mol. F.C22H24N2O5S2
  • Mol. W.460.57 g/mol
  • Stock Status:Instock
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Febuxostat Form A
Febuxostat Form A
  • CAT. No.F180070
  • CAS. No.144060-53-7
  • Mol. F.C16H16N2O3S
  • Mol. W.316.37 g/mol
  • Stock Status:Instock
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3-Descyano-3-Formyl Febuxostat Isobutyl Ester
3-Descyano-3-Formyl Febuxostat Isobutyl Ester
  • CAT. No.F180071
  • CAS. No.1312815-36-3
  • Mol. F.C20H25NO4S
  • Mol. W.375.48 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 45
Febuxostat Impurity 45
  • CAT. No.F180072
  • CAS. No.NA
  • Mol. F.C14H14N2O4S
  • Mol. W.306.34 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 55
Febuxostat Impurity 55
  • CAT. No.F180073
  • CAS. No.1886961-39-2
  • Mol. F.C14H12N2O3S
  • Mol. W.288.32 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 7
Febuxostat Impurity 7
  • CAT. No.F180074
  • CAS. No.NA
  • Mol. F.C16H18N2O4S 
  • Mol. W.334.39 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 54
Febuxostat Impurity 54
  • CAT. No.F180075
  • CAS. No.NA
  • Mol. F.C12H11NO3S
  • Mol. W.249.29 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 32
Febuxostat Impurity 32
  • CAT. No.F180076
  • CAS. No.NA
  • Mol. F.C17H18N2O3S
  • Mol. W.330.40 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 53
Febuxostat Impurity 53
  • CAT. No.F180077
  • CAS. No.NA
  • Mol. F.C13H14NO6PS
  • Mol. W.343.29 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 19
Febuxostat Impurity 19
  • CAT. No.F180078
  • CAS. No.2375033-35-3
  • Mol. F.C18H20N2O3S
  • Mol. W.344.43 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 52
Febuxostat Impurity 52
  • CAT. No.F180079
  • CAS. No.NA
  • Mol. F.C14H14N2O4S
  • Mol. W.306.30 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 51
Febuxostat Impurity 51
  • CAT. No.F180080
  • CAS. No.NA
  • Mol. F.C15H13N3O4S
  • Mol. W.331.35 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 56
Febuxostat Impurity 56
  • CAT. No.F180081
  • CAS. No.NA
  • Mol. F.C12H9NO5S
  • Mol. W.279.33 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 57
Febuxostat Impurity 57
  • CAT. No.F180082
  • CAS. No.NA
  • Mol. F.C16H16N2O3S
  • Mol. W.316.37 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Ethyl Ester Amide Impurity
Febuxostat Ethyl Ester Amide Impurity
  • CAT. No.F180083
  • CAS. No.1346238-15-0
  • Mol. F.C18H22N2O4S
  • Mol. W.362.45 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 9
Febuxostat Impurity 9
  • CAT. No.F180084
  • CAS. No.290294-61-0
  • Mol. F.C6H3NO6S
  • Mol. W.217.16 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 10
Febuxostat Impurity 10
  • CAT. No.F180085
  • CAS. No.NA
  • Mol. F.C17H19NO5S
  • Mol. W.349.40 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 11
Febuxostat Impurity 11
  • CAT. No.F180086
  • CAS. No.NA
  • Mol. F.C18H21NO5S
  • Mol. W.363.43 g/mol
  • Stock Status:Custom Synthesis
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Febuxostat Impurity 4
Febuxostat Impurity 4
  • CAT. No.F180087
  • CAS. No.1330632-48-8
  • Mol. F.C20H20N2O5S2
  • Mol. W.432.51 g/mol
  • Stock Status:Custom Synthesis
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Isotope Labelled Compounds

Febuxostat-D7
Febuxostat-D7
  • CAT. No.F180001
  • CAS. No.NA
  • Mol. F.C16H9D7N2O3S
  • Mol. W.323.42 g/mol
  • Stock Status:Limited Stock
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Febuxostat-D9
Febuxostat-D9
  • CAT. No.F180013
  • CAS. No.1246819-50-0
  • Mol. F.C16H7D9N2O3S
  • Mol. W.325.43 g/mol
  • Stock Status:Under Synthesis
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