You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (Z)-3-[2-(butylamino)-6-(trifluoromethyl)pyridin-3-yl]-N-[[3-fluoro-4-(methanesulfonamido)phenyl]methyl]prop-2-enamide using the IUPAC nomenclature.
user
C21H24F4N4O3S
assistant