26864-44-8 59930-92-6 Cuprate(1-), (3-((2-(hydroxy-kappaO)-4-hydroxyphenyl)azo-kappaN1)-4-(hydroxy-kappaO)benzenesulfonato(3-))-, hydrogen EINECS 248-072-4 Hydrogen (3-((2,4-dihydroxyphenyl)azo)-4-hydroxybenzenesulphonato(3-))cuprate(1-)