[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is an oxacycle."}, {"from": "gpt", "value": "[C@@H1][Branch2][Ring1][Ring2][C@@H1][Branch1][S][C@H1][Branch1][N][C][C][Branch1][Branch1][C@@H1][Ring1][=Branch1][O][O][Ring1][Branch1][O][O][O]"}]