You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4E)-5-(2,3-dimethoxyphenyl)-4-[hydroxy-[4-(2-methylpropoxy)phenyl]methylidene]-1-(3-methoxypropyl)pyrrolidine-2,3-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H33NO7
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