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-methyl-2-[[4-(6-pyrrolidin-1-yl-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)piperidin-1-yl]methyl]pyrimidin-4-one into molecular formula.
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C20H26N8O
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