You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S)-1-(4-methylphenyl)-N-[6-(4-methylpiperazin-1-yl)pyridin-3-yl]-5-oxopyrrolidine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H27N5O2
assistant