The molecule is a biladiene that is the 5-oxo derivative of delta-bilirubin (more correctly known as 10-oxo-delta-bilirubin; see comment). It is a member of biladienes and a dicarboxylic acid. It is a conjugate acid of a 5-oxo-delta-bilirubin(2-).
3-[(2Z)-2-[[3-(2-carboxyethyl)-5-[3-ethenyl-5-[(Z)-(3-ethenyl-4-methyl-5-oxopyrrol-2-ylidene)methyl]-4-methyl-1H-pyrrole-2-carbonyl]-4-methyl-1H-pyrrol-2-yl]methylidene]-4-methyl-5-oxopyrrol-3-yl]propanoic acid