127750-13-4 2-Naphthalenesulfonic acid, 6-amino-4-hydroxy-3-((2-methoxy-4-(phenylazo)phenyl)azo)-, monosodium salt 6-Amino-3-((2-methoxy-4-(phenylazo)phenyl)azo)-4-hydroxy-2-naphthalenesulfonic acid, monosodium salt CCRIS 4171