[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a pyranone that is 4H-pyran substituted by an oxo group at position 4. It derives from a hydride of a 4H-pyran."}, {"from": "gpt", "value": "[C][=C][O][C][=C][C][Ring1][=Branch1][=O]"}]