[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. 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."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][N][C@@H1][Branch1][=Branch1][C][C][C][C][NH3+1][C][=Branch1][C][=O][O-1]"}]