183999-74-8 5-Bromo-6-(2-oxo-2H-1-benzopyran-3-yl)imidazo(2,1-b)-1,3,4-thiadiazole-2-sulfonamide 6-(3-Coumarinyl)-5-bromoimidazo(2,1-b)-1,3,4-thiadiazole-2-sulfonamide Imidazo(2,1-b)-1,3,4-thiadiazole-2-sulfonamide, 5-bromo-6-(2-oxo-2H-1-benzopyran-3-yl)-