[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is an enone that is pent-2-ene in which the two methylene hydrogens have been replaced by an oxo group. It has a role as an EC 1.14.13.39 (nitric oxide synthase) inhibitor, a human urinary metabolite, a biomarker, a plant metabolite and a mouse metabolite."}, {"from": "gpt", "value": "[C][C][=C][C][=Branch1][C][=O][C]"}]