You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4,6-dimethyl-5-[3-[4-[(3-methylphenyl)methyl]piperazin-1-yl]-3-oxopropyl]-2-oxo-1H-pyridine-3-carbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H28N4O2
assistant