[{"from": "human", "value": "Describe this molecule. [C][=C][C][=C][C][=C][C][=C][Branch1][Ring2][N][Ring1][Branch1][C][=C][C][=C][C][=Branch1][Ring2][=N][Ring1][Branch1][C][=N][C][=Branch2][Ring1][Ring2][=C][C][=C][C][=C][Branch1][Ring2][N][Ring1][Branch1][C][=C][Ring2][Ring1][#Branch2][N][Ring2][Ring1][=Branch2][C][=C][Ring1][=C]"}, {"from": "gpt", "value": "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."}]