You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 6-[(7,8-dimethoxy-2-oxo-3H-imidazo[4,5-c]quinolin-1-yl)methyl]pyridine-3-sulfonamide ?
user
C18H17N5O5S
assistant