You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 3-ethyl-1-(3-hydroxy-2-methylpropyl)spiro[6,8-dihydro-5H-pyrazolo[4,3-c]azepine-7,4'-oxane]-4-one is given. What is its corresponding molecular formula?
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C17H27N3O3
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