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4,4'-[1,4-phenylenebis[carbonylimino[6-[(4-sulpho-1-naphthyl)azo]-3,1-phenylene]imino]]bis[4-oxo-2-butenoic] acid Structure

4,4'-[1,4-phenylenebis[carbonylimino[6-[(4-sulpho-1-naphthyl)azo]-3,1-phenylene]imino]]bis[4-oxo-2-butenoic] acid