[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][C][C][C@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}, {"from": "gpt", "value": "The molecule is used experimentally to study protein structure and function. It is structurally similar to METHIONINE, however it does not contain SULFUR."}]