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