You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4Z)-1-(3,5-dimethoxyphenyl)-5-(furan-2-yl)-4-[hydroxy-(3-nitrophenyl)methylidene]pyrrolidine-2,3-dione is the IUPAC name of a molecule. Please give its molecular formula.
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C23H18N2O8
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