[{"from": "human", "value": "Please give me some details about this molecule. [C][C][=Branch1][C][=O][N][C@@H1][Branch1][=Branch1][C][C][C][C][NH3+1][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is an amino acid zwitterion obtained by transfer of a proton from the carboxy to the amino group of N(2)-acetyl-L-lysine; major species at pH 7.3. It has a role as a human metabolite. It is a tautomer of a N(2)-acetyl-L-lysine."}]