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 [4-[5-(4-chlorophenyl)thiophene-2-carbonyl]piperazin-1-yl]-(4-fluorophenyl)methanone using the IUPAC nomenclature.
user
C22H18ClFN2O2S
assistant