[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a berberine alkaloid with formula C19H18NO4 that is isolated from several species of Stephania. It has a role as a plant metabolite and an EC 3.1.1.7 (acetylcholinesterase) inhibitor. It is a berberine alkaloid, an organic heterotetracyclic compound and an organic cation."}, {"from": "gpt", "value": "[C][O][C][=C][Branch2][Ring2][C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][C][N+1][=C][Ring1][#Branch1][C][=C][C][=C][C][=Branch1][N][=C][Branch1][#Branch1][C][Ring1][=Branch1][=C][Ring1][#Branch2][O][C][O][O]"}]