You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 5,6-dimethyl-2-[2-(2-methylmorpholin-4-yl)-2-oxoethyl]sulfanyl-3-propan-2-ylthieno[2,3-d]pyrimidin-4-one .
user
C18H25N3O3S2
assistant