The molecule is a synthetic dipyrrin derived from rings A and D of bilirubin IXalpha in which C-9 carries a 2-[2-(ethoxycarbonyl)phenyl]diazenyl substituent. It is an azo compound and a member of dipyrrins.
3-[5-[(Z)-(3-ethenyl-4-methyl-5-oxopyrrol-2-ylidene)methyl]-2-[(2-ethoxycarbonylphenyl)diazenyl]-4-methyl-1H-pyrrol-3-yl]propanoic acid