[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is the simplest member of the class of 2-pyranones that is 2H-pyran with an oxo substituent at position 2."}, {"from": "gpt", "value": "[C][=C][C][=Branch1][C][=O][O][C][=C][Ring1][#Branch1]"}]