[{"from": "human", "value": "Provide a brief overview of this molecule. [C][Branch1][N][C][=Branch1][C][=O][N][C][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is the zwitterion from the dipeptide glycylglycine formed by proton transfer from the OH of the carboxy group to the terminal amino group. It has a role as a human metabolite. It is a tautomer of a glycylglycine."}]