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 2-(2,3-dimethylspiro[5H-furo[3,4-b]pyridine-7,4'-piperidine]-5-yl)-2-methylpropanenitrile is given. What is its corresponding molecular formula?
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C17H23N3O
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