You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-methyl-4-piperazin-1-yl-7,8-dihydro-6H-thiopyrano[3,2-d]pyrimidin-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C12H19N5S
assistant