You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-(4-acetyl-2-fluorophenyl)piperazin-1-yl]-3-[4-(difluoromethoxy)phenyl]propan-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H23F3N2O3
assistant