[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a C5, branched-chain saturated fatty acid. It has a role as a plant metabolite and a mammalian metabolite. It is a short-chain fatty acid, a methylbutyric acid and a branched-chain saturated fatty acid. It is a conjugate acid of an isovalerate."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][C][C][=Branch1][C][=O][O]"}]