2-Naphthalenesulfonic acid, 3-(phenylazo)-7,7'-ureylenebis(4-hydroxy-, disodium salt 2-Naphthalenesulfonic acid, 4-hydroxy-7-((((5-hydroxy-7-sulfo-2-naphthalenyl)amino)carbonyl)amino)-3-(phenylazo)-, disodium salt 65152-25-2 Disodium 4-hydroxy-7-((((5-hydroxy-7-sulphonato-2-naphthyl)amino)carbonyl)amino)-3-(phenylazo)naphthalene-2-sulphonate EINECS 265-572-8