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-[4-[3-fluoro-4-(methanesulfonamido)phenyl]piperazin-1-yl]ethyl]phenyl]methanesulfonamide using the IUPAC nomenclature.
user
C20H27FN4O4S2
assistant