[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C@@H1][Branch2][Ring1][Ring1][C][=Branch1][C][=O][N][C@@H1][Branch1][=Branch1][C][C][C][C][NH3+1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is a peptide cation obtained by deprotonation of the carboxy terminus and protonation of the side-chain amino groups and the amino terminus of Ala-Lys; major species at pH 7.3. It is a conjugate acid of a member of Ala-Lys."}]