You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-butan-2-yl-N-[2-(2,3-dimethylanilino)-2-oxoethyl]-2-(2,4-dioxo-1,3-diazaspiro[4.4]nonan-3-yl)acetamide by IUPAC nomenclature, provide its molecular formula.
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C23H32N4O4
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