You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5,6-dimethyl-2-[2-[(2R)-2-methyl-2,3-dihydroindol-1-yl]-2-oxoethyl]sulfanyl-3H-thieno[2,3-d]pyrimidin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H19N3O2S2
assistant