The molecule is a member of the class of biladienes that is an analogue of bilirubin in which the double bonds at position 4 and 15 have E-geochemistry. It is a member of biladienes and a dicarboxylic acid. It is a conjugate acid of an (E,E)-bilirubin anion.
3-[2-[[3-(2-carboxyethyl)-5-[(E)-(3-ethenyl-4-methyl-5-oxopyrrol-2-ylidene)methyl]-4-methyl-1H-pyrrol-2-yl]methyl]-5-[(E)-(4-ethenyl-3-methyl-5-oxopyrrol-2-ylidene)methyl]-4-methyl-1H-pyrrol-3-yl]propanoic acid