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 ethyl (2R,3E)-3-[[4-(3-chloro-2-methylanilino)-4-oxobutanoyl]hydrazinylidene]-2-ethylbutanoate is given. What is its corresponding molecular formula?
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C19H26ClN3O4
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