4-((4-((4-((8-Amino-2-hydroxy-6-sulpho-1-naphthyl)azo)-5-methoxy-o-tolyl)azo)-6-sulpho-1-naphthyl)azo)-5-hydroxynaphthalene-2,7-disulphonic acid, potassium sodium salt 83221-46-9 EINECS 280-225-0