You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[(1S)-1-(4-fluorophenyl)ethyl]-2-[4-(3-methoxybenzoyl)piperazin-1-yl]-N-methylacetamide by IUPAC nomenclature, provide its molecular formula.
user
C23H28FN3O3
assistant