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 3-(dimethylamino)-N-(1,3-dioxo-4-propan-2-ylpyrrolo[3,4-c]quinolin-2-yl)thiophene-2-carboxamide ?
user
C21H20N4O3S
assistant