1-Naphthalenediazonium, 4-((5-sulfo-1-naphthalenyl)azo)-, sulfate (2:1) 4-((5-Sulfo-1-naphthyl)azo)-1-naphthalenediazonium sulfate 68938-69-2 Bis(4-((5-sulpho-1-naphthyl)azo)naphthalene-1-diazonium) sulphate EINECS 273-140-5