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,3S,4S,5R)-2-(4-amino-5-ethenylpyrrolo[2,3-d]pyrimidin-7-yl)-4-fluoro-5-(hydroxymethyl)oxolan-3-ol by IUPAC nomenclature, provide its molecular formula.
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C13H15FN4O3
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