[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an iminium ion. It is a conjugate acid of a tacrine."}, {"from": "gpt", "value": "[C][C][C][C][=NH1+1][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=Branch1][#Branch1][=C][Ring1][#Branch2][C][Ring1][=C][N]"}]