You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[N-[(1S,2R)-1,2-dihydroxypropyl]-C-methylcarbonimidoyl]-4-hydroxy-1-methylquinolin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H18N2O4
assistant