You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(7-methoxyquinolin-6-yl)-2-(2-methylpropylamino)thieno[3,2-d]pyrimidine-7-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C21H21N5O2S
assistant