You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (2R,3R,4S,5R)-2-(4-methylpyrrolo[2,3-d]pyrimidin-7-yl)-5-(pyrazol-1-ylmethyl)oxolane-3,4-diol by IUPAC nomenclature, provide its molecular formula.
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C15H17N5O3
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