[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a tetrapeptide composed of L-cysteine, two L-phenylalanine units and glycine joined in sequence by peptide linkages. It has a role as a metabolite. It is functionally related to a L-cysteine, a L-phenylalanine and a glycine."}, {"from": "gpt", "value": "[C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][C@@H1][Branch1][N][C][=Branch1][C][=O][N][C][C][=Branch1][C][=O][O][N][C][=Branch1][C][=O][C@H1][Branch1][#Branch2][C][C][=C][C][=C][C][=C][Ring1][=Branch1][N][C][=Branch1][C][=O][C@H1][Branch1][Ring1][C][S][N]"}]