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 N-[4-[2-oxo-2-[4-[4-(trifluoromethoxy)phenyl]sulfonylpiperazin-1-yl]ethyl]phenyl]acetamide using the IUPAC nomenclature.
user
C21H22F3N3O5S
assistant