75508-33-7 91-34-9 Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5((4-hydroxyphenyl)azo)-, dipotassium salt Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5-((4-hydroxyphenyl)azo)-, dipotassium salt Dipotassium 4,4'-bis((4-hydroxyphenyl)azo)stilbene-2,2'-disulphonate EINECS 278-227-1