[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a pentanone carrying an oxo substituent at position 2. It has a role as a plant metabolite. It is a methyl ketone and a pentanone."}, {"from": "gpt", "value": "[C][C][C][C][=Branch1][C][=O][C]"}]