[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a delta-lactone."}, {"from": "gpt", "value": "[C][C@@][C][C][C@@][Branch1][Branch2][C][Ring1][Branch1][Branch1][C][C][C][Branch1][=Branch1][O][C][Ring1][=Branch2][=O][C][=Branch1][C][=O][O]"}]