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-cyclopropyl-2-(4-fluorophenyl)-2-[4-(3-fluorophenyl)sulfonylpiperazin-1-yl]acetamide using the IUPAC nomenclature.
user
C21H23F2N3O3S
assistant