[{"from": "human", "value": "Describe this molecule. [C][Branch2][Ring1][=Branch2][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][N][C][=Branch1][C][=O][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1][C][NH1+1][=C][Branch1][C][N][N]"}, {"from": "gpt", "value": "The molecule is a dipeptide zwitterion obtained by transfer of two protons from the carboxy to the amino and guanidino groups of beta-Asp-Arg; major species at pH 7.3. It is a tautomer of a beta-Asp-Arg."}]