[{"from": "human", "value": "Provide a description of this molecule. [C][C][Branch1][C][C][C][C@@H1][Branch2][Ring2][C][C][=Branch1][C][=O][N][C@@H1][Branch1][#Branch1][C][C][Branch1][C][C][C][C][=Branch1][C][=O][N][C@@H1][Branch1][#Branch2][C][C][C][NH1+1][=C][Branch1][C][N][N][C][=O][N][C][=Branch1][C][=O][C]"}, {"from": "gpt", "value": "The molecule is a guanidinium ion that is the conjugate acid of leupeptin, arising from protonation of the guanidino group; major species at pH 7.3. It is a conjugate acid of a leupeptin."}]