You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-(1,3-benzothiazol-2-yl)piperidin-1-yl]-2-(5,6-dimethylthieno[2,3-d]pyrimidin-4-yl)sulfanylethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H22N4OS3
assistant