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 2-bromo-1-[1-(4-chlorophenyl)-5-[(1,1-dihydroxythian-4-yl)methyl]-2-methylpyrrol-3-yl]ethanone is given. What is its corresponding molecular formula?
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C19H23BrClNO3S
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