[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a natural product found in Marsupella emarginata with data available."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][O][C@H1][C][C@H1][C@H1][C@@H1][Branch1][Branch1][C][Ring1][=Branch1][=C][C@@][Ring1][=Branch1][Branch1][O][C][C][C][C][Ring1][=Branch2][Branch1][C][C][C][C]"}]