[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a ketone that is 4-hydroxy-2-butanone in which the hydroxy hydrogen has been replaced by a propyl group. It is a ketone and an ether."}, {"from": "gpt", "value": "[C][C][C][O][C][C][C][=Branch1][C][=O][C]"}]