You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (4Z)-5-(3,4-dichlorophenyl)-4-[(4-fluoro-3-methylphenyl)-hydroxymethylidene]-1-(2-methoxyethyl)pyrrolidine-2,3-dione is given. What is its corresponding molecular formula?
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C21H18Cl2FNO4
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