You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(2S)-2-(4-fluorophenyl)-3-[hydroxy-(4-methylphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H15FNO5-
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