You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-ethyl-3-[[2-[(9R)-9-pyridin-2-yl-6-oxaspiro[4.5]decan-9-yl]ethylamino]methyl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H35N3O2
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