You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance [1-(4-acetylpiperazin-1-yl)-1-oxopropan-2-yl] 5-(4-fluorophenyl)thiophene-2-carboxylate .
user
C20H21FN2O4S
assistant