You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2-ethyloxiran-2-yl)-[1-[5-(5-fluoro-2,7-dioxo-8H-pyrido[2,3-d]pyrimidin-3-yl)-3,4-dihydroxyoxolan-2-yl]-2-methylbutan-2-yl]oxyphosphinic acid into its molecular formula.
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C20H27FN3O9P
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