You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5,6-dimethyl-2-[(5-methylpyrimidin-2-yl)sulfanylmethyl]thieno[2,3-d]pyrimidin-4-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H15N5S2
assistant