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-[1-methyl-3-[(2R)-1-methylpyrrolidin-2-yl]indol-5-yl]methanesulfonamide is given. What is its corresponding molecular formula?
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C15H21N3O2S
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