68239-52-1 Chromate(1-), hydroxy(3-(hydroxy-kappaO)-4-((2-(hydroxy-kappaO)-1-naphthalenyl)azo-kappaN1)-7-nitro-1-naphthalenesulfonato(3-))-, hydrogen EINECS 269-447-9 Hydrogen hydroxy(3-hydroxy-4-((2-hydroxy-1-naphthyl)azo)-7-nitronaphthalene-1-sulphonato(3-))chromate(1-)