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For the molecule named 1-[4-chloro-3-(trifluoromethyl)phenyl]sulfonyl-N-(5-propan-2-yl-1,3,4-thiadiazol-2-yl)piperidine-4-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C18H20ClF3N4O3S2
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