Synonyms: Cobaltate(2-), (2,4-dinitro-6-(2-(2-(phenylamino-kappaN)-1-naphthalenyl)diazenyl-kappaN1)phenolato(2-)-kappaO)(3-(hydroxy-kappaO)-4-(2-(2-(hydroxy-kappaO)-1-naphthalenyl)diazenyl-kappaN1)-7-nitro-1-naphthalenesulfonato(3-))-, sodium hydrogen (1:1:1);Cobaltate(2-), (2,4-dinitro-6-((2-(phenylamino)-1-naphthalenyl)azo)phenolato(2-))(3-hydroxy-4-((2-hydroxy-1-naphthalenyl)azo)-7-nitro-1-naphthalenesulfonato(3-))-, sodium hydrogen;Cobaltate(2-), (2,4-dinitro-6-((2-(phenylamino-kappaN)-1-naphthalenyl)azo-kappaN1)phenolato(2-)-kappaO)(3-(hydroxy-kappaO)-4-((2-(hydroxy-kappaO)-1-naphthalenyl)azo-kappaN1)-7-nitro-1-naphthalenesulfonato(3-))-, sodium hydrogen;Sodium hydrogen (6-((2-anilino-1-naphthyl)azo)-2,4-dinitrophenolato(2-))(3-hydroxy-4-((2-hydroxy-1-naphthyl)azo)-7-nitronaphthalene-1-sulphonato(3-))cobaltate(2-)