SMILES: CC1=C(C(=CC2=C(C(=C(N2)O)C)CCC(=O)O)NC1=CC3=NC(=O)C(=C3C=C)C)CCC(=O)O
Description: The molecule is a tripyrrole that is an oxidized metabolite of bilirubin, in which methyl groups are present at positions 2, 7 and 13 with a vinyl group at position 3. It derives from a hydride of a tripyrrin.