[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a 2-oxo monocarboxylic acid. It is functionally related to a but-3-enoic acid."}, {"from": "gpt", "value": "[C][=C][C][=Branch2][Ring1][Ring2][=C][Branch1][=Branch1][C][=C][Ring1][=Branch1][N][/C][=C][/C][=Branch1][C][=O][C][=Branch1][C][=O][O][O]"}]