4-Hydroxy-3-((2-hydroxy-5-nitrophenyl)azo)-7-((3-phosphonophenyl)amino)-2-naphthalenesulfonic acid, sodium salt, cobalt complex (2:1) 69898-68-6 Cobaltate(7-), bis(4-(hydroxy-kappaO)-3-((2-(hydroxy-kappaO)-5-nitrophenyl)azo-kappaN1)-7-((3-phosphonophenyl)amino)-2-naphthalenesulfonato(5-))-, disodium pentahydrogen EINECS 274-210-8 Pentahydrogen disodium bis(4-hydroxy-3-((2-hydroxy-5-nitrophenyl)azo)-7-((3-phosphonophenyl)amino)naphthalene-2-sulphonato(5-))cobaltate(7-)