You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(4-methylthiadiazol-5-yl)methyl]-6-oxo-2-(phenylsulfanylmethyl)-1H-pyrimidine-5-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H15N5O2S2
assistant