155833-00-4 2-Naphthalenesulfonic acid, 6-hydroxy-5-((2-methoxy-5-methyl-3-sulfophenyl)azo)-, disodium salt 6-Hydroxy-5-(2-methoxy-5-methyl-4-sulfophenylazo)-8-(2-methoxy-5-methyl-4-sulfophenoxy)-2-naphthalenesulfonic acid trisodium salt SC-Ntr