7,7'-(Carbonyldiimino)bis(4-hydroxy-3-((2-methyl-4-sulphophenyl)azo)naphthalene-2-sulphonic) acid;4-hydroxy-7-[[5-hydroxy-6-(2-methyl-4-sulfo-phenyl)azo-7-sulfo-2-naphthyl]carbamoylamino]-3-(2-methyl-4-sulfo-phenyl)azo-naphthalene-2-sulfonic acid
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