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 2-[2-(2-methylpropylamino)-2-oxoethyl]-3-oxo-5,6-diphenylpyridazine-4-carboxylate is given. What is its corresponding molecular formula?
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C25H27N3O4
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