You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 3-(2-methylphenyl)-2-(7H-purin-6-ylsulfanylmethyl)-2H-thieno[3,2-d]pyrimidine is given. What is its corresponding molecular formula?
user
C19H16N6S2
assistant