You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[1-[1-(4-fluorophenyl)ethylamino]-1-oxopropan-2-yl]-N-phenylpiperidine-3-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C23H28FN3O2
assistant