[{"from": "human", "value": "What can you tell me about this molecule? [C][/C][=C][\\C@H1][Branch2][=Branch1][=N][C][=Branch1][C][=O][N][=C][/-Ring1][=Branch1][/C][=C][/C][=Branch2][Branch1][=C][=C][Branch2][Branch1][Ring1][/C][=Branch2][Ring2][O][=C][/C][=C][Branch2][Ring1][=C][C][=Branch2][Ring1][=Branch2][=C][Branch1][Ring2][N][Ring1][Branch1][C][C@@H1][C][=Branch1][=N][=C][Branch1][Branch2][C][=Branch1][C][=O][N][Ring1][=Branch1][C][=C][C][C][C][C][C][=Branch1][C][=O][O-1][/N][\\-Ring2][Ring1][O][C][C][C][=Branch1][C][=O][O-1][C][C]"}, {"from": "gpt", "value": "The molecule is a dicarboxylic acid dianion obtained by deprotonation of the carboxy groups of (3E)-phycoerythrobilin; major species at pH 7.3. It is a dicarboxylic acid dianion and a linear tetrapyrrole anion. It is a conjugate base of a (3E)-phycoerythrobilin."}]