[{"from": "human", "value": "Could you provide a description of this molecule? [C][C][C][C][=NH1+1][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=Branch1][#Branch1][=C][Ring1][#Branch2][C][Ring1][=C][N]"}, {"from": "gpt", "value": "The molecule is an iminium ion. It is a conjugate acid of a tacrine."}]