183999-59-9 6-(2-Oxo-2H-1-benzopyran-3-yl)imidazo(2,1-b)-1,3,4-thiadiazole-2-sulfonamide 6-(3-Coumarinyl)-imidazo(2,1-b)-1,3,4-thiadiazole-2-sulfonamide Imidazo(2,1-b)-1,3,4-thiadiazole-2-sulfonamide, 6-(2-oxo-2H-1-benzopyran-3-yl)-