[{"from": "human", "value": "What can you tell me about this molecule? [C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][C@@H1][Branch2][Ring1][#Branch1][C][=Branch1][C][=O][N][C@@H1][Branch1][#Branch2][C][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is an L-aminoacyl-L-amino acid zwitterion resulting from transfer of a proton from the carboxy to the amino group of L-phenylalanyl-L-phenylalanine; major species at pH 7.3. It is a tautomer of a Phe-Phe."}]