[{"from": "human", "value": "Describe this molecule. [C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][C@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is a D-alpha-amino acid zwitterion that is D-phenylalanine in which a proton has been transferred from the carboxy group to the amino group. It is the major species at pH 7.3. It is an enantiomer of a L-phenylalanine zwitterion. It is a tautomer of a D-phenylalanine."}]