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 (4E)-4-[(3-chloro-4-hydroxy-5-methoxyphenyl)methylidene]-1-(3,4-dimethylphenyl)pyrazolidine-3,5-dione is given. What is its corresponding molecular formula?
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C19H17ClN2O4
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