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Name the molecular formula for the molecule established as (6E)-6-[[1-(2,3-dichlorophenyl)-2,5-dimethylpyrrol-3-yl]methylidene]-5-imino-2-methyl-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-one using the IUPAC nomenclature.
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C19H15Cl2N5OS
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