4,4'-Bis((p-hydroxyphenyl)azo)-2,2'-stilbenedisulfonic acid, potassium sodium salt 79069-96-8 91-34-9 Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5-((4-hydroxyphenyl)azo)-, potassium sodium salt Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5-((4-hydroxyphenyl)azo)-, sodium potassium salt EINECS 279-050-2 Potassium sodium 4,4'-bis((4-hydroxyphenyl)azo)stilbene-2,2'-disulphonate