[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is an amino acid zwitterion that is the alpha,beta-didehydro derivative of phenylalanine. Major microspecies at pH 7.3."}, {"from": "gpt", "value": "[C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][=C][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}]