[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a tetrapeptide composed of L-arginine, L-threonine and two L-cysteine units joined in sequence by peptide linkages. It has a role as a metabolite. It is functionally related to a L-arginine, a L-threonine and a L-cysteine."}, {"from": "gpt", "value": "[C][C@H1][Branch2][Ring2][S][C@@H1][Branch2][Ring1][#Branch2][C][=Branch1][C][=O][N][C@@H1][Branch1][Ring1][C][S][C][=Branch1][C][=O][N][C@@H1][Branch1][Ring1][C][S][C][=Branch1][C][=O][O][N][C][=Branch1][C][=O][C@H1][Branch1][#Branch2][C][C][C][N][=C][Branch1][C][N][N][N][O]"}]