You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 5-[(3-bromo-5-methoxy-4-prop-2-ynoxyphenyl)methylidene]-3-[(4-chlorophenyl)methyl]imidazolidine-2,4-dione into molecular formula.
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C21H16BrClN2O4
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