You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-bromo-2-chloro-N-(1-propylsulfonyl-3,4-dihydro-2H-quinolin-6-yl)benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H20BrClN2O3S
assistant