You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 9-[(2R,5R)-5-(dimethylphosphorylmethoxy)-3-fluoro-2,5-dihydrofuran-2-yl]-6-methoxypurine into its molecular formula.
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C13H16FN4O4P
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