[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a member of 4-pyranones."}, {"from": "gpt", "value": "[C][O][C][=C][O][C][=Branch1][=Branch1][=C][C][Ring1][=Branch1][=O][C][S][P][=Branch1][C][=O][Branch1][Ring1][O][C][O][C]"}]