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 [5-methyl-5-(methylaminomethyl)-4H-pyridin-2-yl]-[1-(2-methylpropyl)piperidin-4-yl]methanone is given. What is its corresponding molecular formula?
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C18H31N3O
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