You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-[2-(4-bromo-2-methylanilino)-2-oxoethyl]-3-methylsulfonylimidazo[1,5-a]pyridine-1-carboxamide ?
user
C18H17BrN4O4S
assistant