You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[[4-(4-methylsulfonylpiperazin-1-yl)phenyl]carbamothioyl]-2,1,3-benzothiadiazole-5-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C19H20N6O3S3
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