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 N-[[1-(5,6,7,8-tetrahydrocinnolin-3-yl)azetidin-3-yl]methyl]furo[2,3-d]pyridazin-7-amine is given. What is its corresponding molecular formula?
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C18H20N6O
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