You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-thiophen-2-yl-6,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl)-(3,4,5-trimethoxy-2-nitrophenyl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H20N2O6S2
assistant