1-Naphthalenesulfonic acid, 3-((2,4-dimethoxy-6-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-4-hydroxy- 3-((2,4-Dimethoxy-6-((2-(sulphooxy)ethyl)sulphonyl)phenyl)azo)-4-hydroxynaphthalene-1-sulphonic acid 67674-29-7 EINECS 266-869-5