1-Naphthalenediazonium, 4-((3-sulfophenyl)azo)-, sulfate (2:1) 4-((m-Sulfophenyl)azo)-1-naphthylenediazonium sulfate 68938-67-0 Bis(4-((3-sulphophenyl)azo)naphthalene-1-diazonium) sulphate EINECS 273-138-4