[{"from": "human", "value": "Describe this molecule. [C][C@H1][Branch1][O][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][C][=O]"}, {"from": "gpt", "value": "The molecule is a L-leucine derivative that is L-leucine substituted by an oxo group at position 5. It is a non-proteinogenic L-alpha-amino acid and a L-leucine derivative."}]