You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-[[(3S,3aS,6aS)-5-(3-methylphenyl)sulfonyl-2,3,3a,4,6,6a-hexahydrofuro[2,3-c]pyrrol-3-yl]methyl]pyrrolidin-2-one into molecular formula.
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C18H24N2O4S
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