A 77-1726

CAS: 163451-81-8

Ref. TR-A771726

Product Information

• Name: A 77-1726
• Synonyms: Leflunomide Imp. B (EP), (2Z)-2-Cyano-3-hydroxy-N-[4-(trifluoromethyl)phenyl]but-2-enamide, (2Z)-2-cyano-3-hydroxy-N-[4-(trifluoromethyl)phenyl]-2-Butenamide, 2-Butenamide, 2-cyano-3-hydroxy-N-[4-(trifluoromethyl)phenyl]-, (Z)-, A 1726, A 771726, Aubagio, Flucyamide, HMR 1726, SU 20, Teriflunomide, Leflunomide Impurity B, (2Z)-2-(hydroxy{[4-(trifluoromethyl)phenyl]amino}methylidene)-3-oxobutanenitrile, (2Z)-2-Cyano-3-hydroxy-N-[4-(trifluoromethyl)phenyl]-2-butenamide, (Z)-2-Cyano-alpha'alpha'alpha-trifluoro-3-hydroxy-p-crotonotoluidide, 2-Butenamide, 2-cyano-3-hydroxy-N-(4-(trifluoromethyl)phenyl)-, 2-Butenamide, 2-cyano-3-hydroxy-N-[4-(trifluoromethyl)phenyl]-, (2Z)-, 2-Butenamide, 2-cyano-3-hydroxy-N-[4-(trifluoromethyl)phenyl]-, (Z)-, 2-Cyano-3-hydroxy-N-(4-(trifluoromethyl)phenyl)-2-butenamide, A771726, Active metabolite of leflunomide, Femorix, Hmr 1726, Malononitrilamide, N-(4-Trifluoromethylphenyl)-2-cyano-2-hydroxycrotonamide, Su 20, Teriflunomide [INN], Unii-1C058Ikg3B
• CAS: 163451-81-8

Description

Impurity Leflunomide EP Impurity B
Applications A77 1726 (Leflunomide EP Impurity B) is the active metabolite of Leflunomide, a potent disease-modifying antirheumatic drug used in the treatment of rheumatoid arthritis. LEF-M interferes with dendritic cell function. The second Phase III study evaluating the efficacy of Genzyme’s teriflunomide therapy against relapsing forms of multiple sclerosis found the once-daily oral drug to be no less effective than injectable interferon beta 1a (Rebif®).
References Kirsch, B.M., et al.: Arthritis Research and Therapy, 7, 3, R694, (2005)

• Brand: TRC

Chemical properties

• Molecular weight: 270.21
• Formula: C₁₂H₉F₃N₂O₂
• Color/Form: White to Off-White Solid
• InChI: InChI=1S/C12H9F3N2O2/c1-7(18)10(6-16)11(19)17-9-4-2-8(3-5-9)12(13,14)15/h2-5,18H,1H3,(H,17,19)/b10-7-
• SMILES: C/C(O)=C(\C#N)C(=O)Nc1ccc(C(F)(F)F)cc1