[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is a C4-acylcarnitine that is the O-butanoyl derivative of carnitine. It has a role as a human metabolite. It is a C4-acylcarnitine and a butyrate ester. It is functionally related to a butyric acid."}, {"from": "gpt", "value": "[C][C][C][C][=Branch1][C][=O][O][C][Branch1][#Branch1][C][C][=Branch1][C][=O][O-1][C][N+1][Branch1][C][C][Branch1][C][C][C]"}]