[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is the fatty acid ethyl ester of 2-octenoic acid. It has a role as a metabolite."}, {"from": "gpt", "value": "[C][C][C][C][C][/C][=C][/C][=Branch1][C][=O][O][C][C]"}]