N-(4-Trifluoromethylphenyl)-2-cyano-3-hydroxycrotonamide; (Z)-2-Cyano-3-hydroxy-N-(4-(trifluoromethyl)phenyl)but-2-enamide;2-Cyano-3-hydroxy-N-[4-(trifluoromethyl)phenyl]-2-beuteamide; Leflunomide Related Compound B (USP)