[{"from": "human", "value": "Provide a brief overview of this molecule. [C][=C][Branch1][=Branch1][N][C][=N][Ring1][Branch1][C][C@@H1][Branch2][Ring1][=Branch1][C][=Branch1][C][=O][N][C@@H1][Branch1][=Branch2][C][C][=C][N][=C][N][Ring1][Branch1][C][=Branch1][C][=O][O][N][C][=Branch1][C][=O][C@H1][Branch1][Ring1][C][S][N][C][=Branch1][C][=O][C@H1][Branch1][Ring1][C][S][N]"}, {"from": "gpt", "value": "The molecule is a tetrapeptide composed of two L-cysteine units joined to two L-histidine units by a peptide linkage. It has a role as a metabolite. It is functionally related to a L-cysteine and a L-histidine."}]