[{"from": "human", "value": "What can you tell me about this molecule? [C][C][C@H1][Branch2][Ring1][Ring2][N][Branch1][Ring2][C][Ring1][Branch1][C][=Branch1][C][=O][C@H1][Branch1][=Branch1][C][C][C][C][NH3+1][NH3+1][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a peptide cation obtained by deprotonation of the carboxy terminus and protonation of the side-chain amino group and the amino terminus of Lys-Pro; major species at pH 7.3. It is a conjugate acid of a Lys-Pro."}]