72968-75-3 EINECS 277-151-6 Ethanesulfonic acid, 2-(((2,5-dichloro-4-((2-phenyl-1H-indol-3-yl)azo)phenyl)sulfonyl)amino)-, monosodium salt Ethanesulfonic acid, 2-(((2,5-dichloro-4-((2-phenylindol-3-yl)azo)phenyl)sulfonyl)amino)-, sodium salt Sodium 2-(((2,5-dichloro-4-((2-phenyl-1H-indol-3-yl)azo)phenyl)sulphonyl)amino)ethanesulphonate