2-Naphthalenesulfonic acid, 6-((7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo)-3-((4-((4-amino-6(or 7)-sulfo-1-naphthalenyl)azo)phenyl)azo)-4-hydroxy-, trisodium salt 39384-51-5 8003-69-8 C.I. Direct Black 80 DIRECT BLACK 80 EINECS 232-322-4 Trisodium 6-((7-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo)-3-((4-((4-amino-6(or 7)-sulphonatonaphthyl)azo)phenyl)azo)-4-hydroxynaphthalene-2-sulphonate