[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][N][Branch1][C][C][C][=Branch1][C][=O][O][C][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][N+1][Branch1][C][C][Branch1][C][C][C]"}, {"from": "gpt", "value": "A cholinesterase inhibitor used in the treatment of myasthenia gravis and to reverse the effects of muscle relaxants such as gallamine and tubocurarine. Neostigmine, unlike physostigmine, does not cross the blood-brain barrier."}]