You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-6-[(2-methoxynaphthalen-1-yl)methyl]-N-(2-phenylethyl)-6-azaspiro[2.5]octane-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H32N2O2
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