You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-ethyl-7-[(5-phenyl-1H-1,2,4-triazol-3-yl)sulfanylmethyl]-[1,3,4]thiadiazolo[3,2-a]pyrimidin-5-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H14N6OS2
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