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> 3-[(2E,5E)-5-[[4-(2-carboxyethyl)-5-[(E)-(4-ethenyl-3-methyl-5-oxopyrrol-2-ylidene)methyl]-3-methyl-1H-pyrrol-2-yl]methylidene]-2-[(4-ethenyl-3-methyl-5-oxopyrrol-2-yl)-phenylmethylidene]-4-methylpyrrol-3-yl]propanoic acid