You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-amino-7-ethylsulfanyl-[1,2,4]triazolo[5,1-c][1,2,4]triazin-3-yl)-phenylmethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H12N6OS
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