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-[[4-(4-fluoro-2-azabicyclo[2.1.1]hexane-2-carbonyl)spiro[2-oxabicyclo[2.1.1]hexane-3,4'-piperidine]-1-yl]methyl]acetamide is given. What is its corresponding molecular formula?
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C18H26FN3O3
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