4-Hydroxy-7-((((5-hydroxy-6-((2-methoxyphenyl)azo)-7-sulpho-2-naphthyl)amino)carbonyl)amino)-3-((6-sulpho-2-naphthyl)azo)naphthalene-2-sulphonic acid, potassium sodium salt 83232-36-4 EINECS 280-269-0