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 2-bicyclo[2.2.1]heptanyl-[3-[(1-methylimidazol-2-yl)methyl]piperidin-1-yl]methanone is given. What is its corresponding molecular formula?
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C18H27N3O
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