You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(2R)-2-acetyloxy-2-[(2S,3S,5R)-3-(1,3-dioxoisoindol-2-yl)-5-(5-fluoro-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]ethyl] acetate by IUPAC nomenclature, provide its molecular formula.
user
C22H20FN3O9
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