You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-[(5-methylfuran-2-yl)methyl]-1-phenyl-3,6-diazatricyclo[4.3.1.13,8]undecan-9-amine by IUPAC nomenclature, provide its molecular formula.
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C21H27N3O
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