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m-[8-Amino-1-hydroxy-7-[p-(2-hydroxyethylsulfonyl)phenylazo]-3,6-di(potassiooxysulfonyl)-2-naphtylazo]benzoic acid potassium salt Structure

m-[8-Amino-1-hydroxy-7-[p-(2-hydroxyethylsulfonyl)phenylazo]-3,6-di(potassiooxysulfonyl)-2-naphtylazo]benzoic acid potassium salt