[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a beta-lactone."}, {"from": "gpt", "value": "[C][C@@H1][C@H1][Branch1][=Branch1][O][C][Ring1][Ring2][=O][C@H1][Branch1][C][C][C][C][Branch1][C][C][C][C][Branch1][C][C][C][C][Branch1][C][C][C]"}]