2-Naphthalenesulfonic acid, 3-((6-sulfo-2-naphthyl)azo)-7,7'-ureylenebis(4-hydroxy-, trisodium salt (8CI) 2-Naphthalenesulfonic acid, 4-hydroxy-7-((((5-hydroxy-7-sulfo-2-naphthalenyl)amino)carbonyl)amino)-3-((6-sulfo-2-naphthalenyl)azo)-, trisodium salt 6330-95-6 NSC 45616