[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][C][C][=N][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=Branch1][#Branch1][=C][Ring1][#Branch2][C][Ring1][=C][N]"}, {"from": "gpt", "value": "The molecule has been used to counter the effects of muscle relaxants, as a respiratory stimulant, and in the treatment of Alzheimer's disease and other central nervous system disorders. Tacrine has been discontinued for the United States market."}]