2-Naphthalenesulfonic acid, 3-((4-((4-amino-2-sulfophenyl)azo)-6-sulfo-1-naphthalenyl)azo)-7-((6-((4-((4-amino-2-sulfophenyl)azo)-7-sulfo-1-naphthalenyl)azo)-5-hydroxy-7-sulfo-2-naphthalenyl)amino)-4-hydroxy-, hexasodium salt 2-Naphthalenesulfonic acid, 7,7'-iminobis(3-((4-((4-amino-2-sulfophenyl)azo)-6-sulfo-1-naphthyl)azo)-4-hydroxy-, hexasodium salt 71033-10-8 75768-92-2 76631-47-5