3,3'-(Carbonylbis(imino(5-ethoxy-2-methyl-4,1-phenylene)azo))bis(6-chlorobenzenesulphonic) acid;2-chloro-5-[4-[[4-(4-chloro-3-sulfo-phenyl)azo-2-ethoxy-5-methyl-phenyl]carbamoylamino]-5-ethoxy-2-methyl-phenyl]azo-benzenesulfonic acid
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