[{"from": "human", "value": "What can you tell me about this molecule? [H+1].[C][N][Branch1][C][C][C][=Branch1][C][=N][N][=C][Branch1][C][N][N]"}, {"from": "gpt", "value": "The molecule is a guanidinium ion obtained by monoprotonation of metformin. It is a conjugate acid of a metformin."}]