You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 3-[4-[(3-aminopropylamino)methyl]cyclohexa-1,5-dien-1-yl]-9-methyl-8-[(3-nitrophenyl)methyl]pyrimido[1,2-a]pyrimidine-2,6-dione into molecular formula.
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C25H28N6O4
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