2-((2-Hydroxy-1-napthalenyl)azo)-1-naphthalenesulfonic acid, magnesium salt (2:1) 67893-11-2 Dihydrogen bis(2-((2-hydroxy-1-naphthyl)azo)naphthalene-1-sulphonato(2-))magnesate(2-) EINECS 267-614-0 Magnesate(2-), bis(2-((2-(hydroxy-kappaO)-1-naphthalenyl)azo-kappaN1)-1-naphthalenesulfonato(2-)-kappaO)-, dihydrogen