[{"from": "human", "value": "Provide a description of this molecule. [C][N][C][C][N][Branch1][Branch1][C][C][Ring1][=Branch1][C][=Branch1][C][=O][O][C@H1][C][=N][C][=C][N][=C][Ring1][=Branch1][C][=Branch1][C][=O][N][Ring1][#Branch2][C][=N][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][Cl]"}, {"from": "gpt", "value": "The molecule is the (5S)- (active) enantiomer of zopiclone. Unlike almost all other hypnotic sedatives, which are approved only for the relief of short-term (6-8 weeks) insomnia, eszopiclone is approved by the U.S. Food and Drug Administration for long-term use. It has a role as a sedative and a central nervous system depressant. It is an enantiomer of a (5R)-zopiclone."}]