You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2-amino-3-methyl-4-methyliminobut-2-enyl)-N-methyl-3-[1-[4-(oxan-4-ylmethylamino)-5-oxo-6,7-dihydrothieno[3,2-d]pyrimidin-2-yl]piperidin-4-yl]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H43N7O3S
assistant