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For the molecule named 4-[3-chloro-4-[4-(4,5-dimethyl-1,3-thiazol-2-yl)piperazin-1-yl]sulfonylphenyl]-2-methyl-1,4-oxazepane by IUPAC nomenclature, provide its molecular formula.
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C21H29ClN4O3S2
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