You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(3,5-dichlorophenyl)-N-[1-(3,4-dihydro-2H-quinolin-1-yl)-1-oxopropan-2-yl]methanesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H20Cl2N2O3S
assistant