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 1-(4-chlorophenyl)-N-[2-(2,5-dimethyl-1H-pyrrol-3-yl)ethyl]methanesulfonamide is given. What is its corresponding molecular formula?
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C15H19ClN2O2S
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