6-hydroxy-5-(2-methoxy-5-methyl-4-sulfophenylazo)-8-(2-methoxy-5-methyl-4-sulfophenoxy)-2-naphthalenesulfonic acid trisodium salt
6-hydroxy-5-(2-methoxy-5-methyl-4-sulfophenylazo)-8-(2-methoxy-5-methyl-4-sulfophenoxy)-2-naphthalenesulfonic acid trisodium salt