You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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N-benzyl-3-(3-cyclopentyloxy-4-methoxyphenyl)-1-oxa-2,8-diazaspiro[4.5]dec-3-ene-8-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
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C27H33N3O4
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