50814-28-3 Benzenesulfonic acid, 4-((4-((2-phenyl-1H-indol-3-yl)azo)phenyl)azo)-, monosodium salt EINECS 256-781-5 Sodium 4-((4-((2-phenyl-1H-indol-3-yl)azo)phenyl)azo)benzenesulphonate