You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-[(3,5-dioxo-2H-1,2,4-triazin-6-yl)sulfanyl]-1,3,9-trimethylpurine-2,6-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C11H11N7O4S
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