You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 6-[4-[2-(dimethylamino)ethoxy]-2-phenylpyrazol-3-yl]-2-propan-2-ylpyridazin-3-one by IUPAC nomenclature, provide its molecular formula.
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C20H25N5O2
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