[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is the fatty acid ethyl ester of isovaleric acid. It has a role as a metabolite. It is a fatty acid ethyl ester and an olefinic compound. It is functionally related to an isovaleric acid."}, {"from": "gpt", "value": "[C][C][O][C][=Branch1][C][=O][C][C][Branch1][C][C][C]"}]