120206-82-8 2,2'-Stilbenedisulfonic acid, 4,4'-bis((p-((p-sulfophenyl)azo)phenyl)azo)-, potassium sodium salt Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5-((4-((4-sulfophenyl)azo)phenyl)azo)-, potassium sodium salt