[{"from": "human", "value": "What can you tell me about this molecule? [C][=C][Branch1][=C][C][=Branch1][C][=O][N][C][=Branch1][C][=O][C][Ring1][Branch2][=O][C][=C][Branch1][=N][N][C][=Branch1][C][=O][C][=Branch1][Ring2][=C][Ring1][#Branch1][O][O]"}, {"from": "gpt", "value": "The molecule is an extended quinone obtained by formal autoxidation of 2,3,6-trihydroxypyridine. It has a role as a biological pigment. It is functionally related to a 2,3,6-trihydroxypyridine. It is a conjugate acid of a nicotine blue(2-)."}]