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-[1-(benzenesulfonyl)-2-methyl-5-phenylpyrrol-3-yl]-N-methylmethanamine;hydrochloride is given. What is its corresponding molecular formula?
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C19H21ClN2O2S
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