116686-15-8 4'-Acetyl-2'-(2,4-difluorophenoxy)methanesulfonanilide FK 3311 FK-3311 Methanesulfonamide, N-(4-acetyl-2-(2,4-difluorophenoxy)phenyl)- N-(4-Acetyl-2-(2,4-difluorophenoxy)phenyl)methanesulfonamide