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 (5aR,10bR)-9-(benzenesulfonyl)-1-methyl-1,2,3,4,5,5a,6,10b-octahydroazepino[4,5-b]indole is given. What is its corresponding molecular formula?
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C19H22N2O2S
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