You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(7-methyl-2-methylsulfanyl-8-sulfanylidene-5,6-dihydro-4H-[1,2,4]triazolo[1,5-d][1,2,4,6]tetrazepin-5-yl)benzonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H13N7S2
assistant