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-(3-fluoropyridin-4-yl)-6-[3-(trifluoromethyl)piperidin-1-yl]-1,8a-dihydroimidazo[1,2-b]pyridazine-3-carboxamide is given. What is its corresponding molecular formula?
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C18H18F4N6O
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