You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]-1-(2-phenylethyl)pyrrolidine-2,3-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H33NO5
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