You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4Z)-4-[hydroxy-(4-methoxy-3-methylphenyl)methylidene]-5-(4-propan-2-ylphenyl)-1-(pyridin-4-ylmethyl)pyrrolidine-2,3-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H28N2O4
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