zwitterionic compounds selected from : taurine , 2ethanesulphonic acid , n - iminodiacetic acid , piperazine - n , n &# 39 ; bis , n -- 2 - aminoethanesulphonic acid , n , n - bis - 2 - aminoethanesulphonic acid , 3 - propanesulphonic , n - n - methyl ]- 2 - aminoethanesulphonic acid , n - 2 - hydroxyethylpiperazine - n &# 39 ;- 2 - ethanesulphonic acid , n - 2 - hydroxyethylpiperazine - n &# 39 ; 3 - propanesulphonic acid epps ), 2 - ethanesulphonic acid or 3 - propanesulphonic acid , and their n - halo derivatives can be used separately or in combination in the treatment of related clinical conditions by stimulating myeloperoxidase activity , which in turn stimulates hypochlorous acid production in vivo , which leads inter alia to enhanced leukotriene inactivation .