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Under IUPAC nomenclature, a molecule named 8b-(4-fluorophenyl)sulfonyl-6-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-2,3,3a,4-tetrahydro-1H-indeno[2,1-b]pyrrole is given. What is its corresponding molecular formula?
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C20H15F8NO2S
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