You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name [4-(3-chlorophenyl)piperazin-1-yl]-[(3R)-1,1-dioxo-6-(trifluoromethyl)-3,4-dihydro-2H-1lambda6,2,4-benzothiadiazin-3-yl]methanone into its molecular formula.
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C19H18ClF3N4O3S
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