You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4Z)-4-[hydroxy-(4-nitrophenyl)methylidene]-5-(3-methoxyphenyl)-1-[2-(4-methoxyphenyl)ethyl]pyrrolidine-2,3-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H24N2O7
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