SMILES: C1=CC2=CC3=CC=C(N3)C=C4C=CC(=N4)C5=NC(=CC6=CC=C(N6)C=C1N2)C=C5
Description: The molecule is a cyclic pentapyrrole where the five pyrrole units are joined at their 2- and 5-positions via four methine linkages and one direct 2-5'-linkage.