You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2R,3S,4R,5R)-2-(methoxymethyl)-5-(6-methylsulfanylpurin-9-yl)oxolane-3,4-diol into its molecular formula.
user
C12H16N4O4S
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