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2-Hydroxy-5-[[4'-[(2,4-dihydroxyphenyl)azo]-1,1'-biphenyl-4-yl]azo]benzoic acid sodium salt Structure

2-Hydroxy-5-[[4'-[(2,4-dihydroxyphenyl)azo]-1,1'-biphenyl-4-yl]azo]benzoic acid sodium salt