You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-methyl-N-[(2S)-4-methyl-1-oxo-1-(4-phenylpiperazin-1-yl)pentan-2-yl]benzenesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H31N3O3S
assistant