[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a natural product found in Sargassum siliquastrum with data available."}, {"from": "gpt", "value": "[C][C][=C][C][=Branch2][Ring1][P][=C][C][=C][Ring1][=Branch1][O][C@][Branch1][Branch1][C][C][Ring1][=Branch1][Branch1][C][C][C][C][/C][=C][Branch1][C][\\C][/C][C][/C][=C][Branch1][C][\\C][/C][=O][O]"}]