You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[[5,6-dimethyl-4-(methylamino)thieno[2,3-d]pyrimidin-2-yl]methyl-propan-2-ylamino]ethanol by IUPAC nomenclature, provide its molecular formula.
user
C15H24N4OS
assistant