You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named pyridin-4-yl-[9-[(2,2,4-trimethyl-3H-1-benzofuran-7-yl)methyl]-3,9-diazaspiro[5.5]undecan-3-yl]methanone by IUPAC nomenclature, provide its molecular formula.
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C27H35N3O2
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