You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S,3S,4R,5S)-2-(hydroxymethyl)-5-(4-methylsulfanylpyrrolo[2,3-d]pyrimidin-7-yl)oxolane-3,4-diol by IUPAC nomenclature, provide its molecular formula.
user
C12H15N3O4S
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