[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is a butanoate ester of butan-1-ol. It has a role as a metabolite. It is functionally related to a butan-1-ol."}, {"from": "gpt", "value": "[C][C][C][C][O][C][=Branch1][C][=O][C][C][C]"}]