(3Z)-3-[hydroxy(1,3-thiazol-2-ylamino)methylidene]-2-methyl-2,3-dihydro-4H-1,2-benzothiazin-4-one 1,1-dioxide;4-hydroxy-2-methyl-N-(1,3-thiazol-2-yl)-2H-1,2-benzothiazine-3-carboxamide 1,1-dioxide
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