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 N-[(6S,11S)-4-[[(1S)-cyclohex-3-en-1-yl]methyl]-1-oxa-4-azaspiro[5.5]undecan-11-yl]-2-methylpropane-1-sulfonamide is given. What is its corresponding molecular formula?
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C20H36N2O3S
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