You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-cyclohexyl-2-[6-ethyl-5-methyl-3-[(4-methylphenyl)methyl]-4-oxothieno[2,3-d]pyrimidin-2-yl]sulfanylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H31N3O2S2
assistant