The molecule is a biladiene that is a linear tetrapyrrole and a regioisomer of bilirubin IXalpha, in which the dipyrroles are of endovinyl type only. It is a member of biladienes and a dicarboxylic acid.
3-[2-[[3-(2-carboxyethyl)-5-[(Z)-(3-ethenyl-4-methyl-5-oxopyrrol-2-ylidene)methyl]-4-methyl-1H-pyrrol-2-yl]methyl]-5-[(Z)-(3-ethenyl-4-methyl-5-oxopyrrol-2-ylidene)methyl]-4-methyl-1H-pyrrol-3-yl]propanoic acid