[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a phenylalanine derivative."}, {"from": "gpt", "value": "[13CH1][=13CH1][13CH1][=13C][Branch1][Branch1][13CH1][=13CH1][Ring1][=Branch1][13CH2][13C@@H1][Branch1][=Branch1][13C][=Branch1][C][=O][O][N]"}]