[{"from": "human", "value": "What can you tell me about this molecule? [C][C][=C][Branch2][=Branch1][Branch2][/C][=Branch2][Ring2][#C][=C][/C][=C][Branch2][Ring2][C][C][=Branch2][Ring1][=N][=C][Branch1][Ring2][N][Ring1][Branch1][C][=Branch1][C][=O][C][=C][Branch1][=C][C][=Branch1][=Branch2][=C][Branch1][Ring2][N][Ring1][Branch1][C][=O][C][=C][C][C][C][C][C][=Branch1][C][=O][O-1][/N][/C][\\-Ring2][Ring1][=N][=C][\\C][=N][C][=Branch1][C][=O][C][=Branch1][=Branch1][=C][Ring1][=Branch1][C][=C][C][C][C][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a linear tetrapyrrole anion obtained by deprotonation of the two carboxy groups of mycobilin b; major species at pH 7.3. It is a dicarboxylic acid dianion and a linear tetrapyrrole anion. It is a conjugate base of a mycobilin b."}]