4,4'-(1,4-Phenylenebis(carbonylimino(6-((4-sulpho-1-naphthyl)azo)-3,1-phenylene)imino))bis(4-oxo-2-butenoic) acid;4-[[5-[[4-[[3-[(4-hydroxy-4-oxo-but-2-enoyl)amino]-4-[(4-sulfo-1-naphthyl)azo]phenyl]carbamoyl]benzoyl]amino]-2-[(4-sulfo-1-naphthyl)azo]phenyl]amino]-4-oxo-but-2-enoic acid
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