4-((1-Hydroxy-6-((((5-hydroxy-6-(phenylazo)-7-sulpho-2-naphthyl)amino)carbonyl)amino)-3-sulpho-2-naphthyl)azo)benzoic acid;4-{(2E)-2-[1-oxo-6-({[(6E)-5-oxo-6-(2-phenylhydrazinylidene)-7-sulfo-5,6-dihydronaphthalen-2-yl]carbamoyl}amino)-3-sulfonaphthalen-2(1H)-ylidene]hydrazinyl}benzoic acid
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