Cuprate(2-), (2-(hydroxy-kappaO)-3-(2-(2-(hydroxy-kappaO)-4-hydroxy-3-(2-(4-nitro-2-sulfophenyl)diazenyl)phenyl)diazenyl-kappaN1)-5-nitrobenzenesulfonato(4-))-, sodium;Cuprate(2-), (3-((2,4-dihydroxy-3-((4-nitro-2-sulfophenyl)azo)phenyl)azo)-2-hydroxy-5-nitrobenzenesulfonato(4-))-, sodium
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