You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 7-methyl-N-[2-([1,2,4]triazolo[4,3-a]pyridin-3-yl)ethyl]-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-amine by IUPAC nomenclature, provide its molecular formula.
user
C19H20N6S
assistant