26921-01-7 Bis(hydrogen 3-hydroxy-4-((2-hydroxy-1-naphthyl)azo)-7-nitronaphthalene-1-sulphonato(2-))cobaltate(1-) Cobaltate(1-), bis(hydrogen 3-hydroxy-4-((2-hydroxy-1-naphthyl)azo)-7-nitro-1-naphthalenesulfonato(2-))- EINECS 248-109-4