[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an oxacycle."}, {"from": "gpt", "value": "[C][C][=Branch2][Ring1][C][=C][C][C][C@][Branch1][O][C@@H1][Branch1][Branch1][C][Ring1][=Branch1][=O][O][Ring1][Branch1][C][C]"}]