4-Bromobenzenesulfonamide was used as reagent in preparation of cobalt(III) complexes of N,R-sulfonyldithiocarbimate anion. It was also used in the synthesis of 2-, 3- and 4-(substituted-phenylethynyl)benzenesulfonamides.4-Bromobenzenesulfonamide is a metabolite of ebrotidine, a new H2-receptor antagonist. Product Application： 4-Bromobenzenesulfonamide was used as reagent in preparation of cobalt(III) complexes of N,R-sulfonyldithiocarbimate anion. It was also used in the synthesis of 2-, 3- and 4-(substituted-phenylethynyl)benzenesulfonamides.4-Bromobenzenesulfonamide is a metabolite of ebrotidine, a new H2-receptor antagonist.