[{"from": "human", "value": "Describe this molecule. [C][C][=Branch1][C][=O][N][C][C][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}, {"from": "gpt", "value": "The molecule is an ornithine derivative in which one of the amino hydrogens on the side-chain of ornithine has been replaced by an acetyl group. It is a tautomer of a N(5)-acetylornithine zwitterion."}]