2-Naphthalenesulfonic acid, 4-hydroxy-3-((4-methoxy-2-sulfophenyl)azo)-6-(methylamino)- 4-Hydroxy-3-((4-methoxy-2-sulfophenyl)azo)-6-(methylamino)-2-naphthalenesulfonic acid 4-Hydroxy-3-((4-methoxy-2-sulphophenyl)azo)-6-(methylamino)naphthalene-2-sulphonic acid 68133-27-7 EINECS 268-670-9