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-tert-butyl-6-[1-(2,2-dimethylpropyl)-2-methylpiperidin-4-yl]-2,6-diazaspiro[3.3]heptane is given. What is its corresponding molecular formula?
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C20H39N3
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