You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (3S)-1-[[(3S)-8-(2-methylphenyl)sulfonyl-2-oxa-8-azaspiro[4.5]decan-3-yl]methyl]pyrrolidin-3-ol into molecular formula.
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C20H30N2O4S
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