You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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N-[(4-methoxy-6-methylpyridin-2-yl)methyl]-2,3,5,6,7,8-hexahydro-1H-pyrrolizin-1-amine is the IUPAC name of a molecule. Please give its molecular formula.
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C15H23N3O
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