[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is an N-acylglycine in which the acyl group is specified as isobutryl. It has a role as a human urinary metabolite. It is a conjugate acid of a N-isobutyrylglycinate."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][C][=Branch1][C][=O][N][C][C][=Branch1][C][=O][O]"}]