You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (E)-N-[1-(4-benzylpiperazin-1-yl)-1-oxopropan-2-yl]-3-phenylprop-2-enamide by IUPAC nomenclature, provide its molecular formula.
user
C23H27N3O2
assistant