You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-ethyl-6-[(5-methyl-1,3,4-thiadiazol-2-yl)sulfanyl]-2-propan-2-ylpyrimidin-4-amine into molecular formula.
user
C12H17N5S2
assistant