You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-(5-chloro-2-methylphenyl)-2,2-dimethyl-3-oxo-1,4-dihydroquinolin-7-yl]methanesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H21ClN2O3S
assistant