[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a purine nucleoside."}, {"from": "gpt", "value": "[C][=N][C][=C][Branch2][Ring1][Branch1][N][Ring1][Branch1][C@H1][C@@H1][Branch1][=N][C@@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][Branch1][C][O][O][O][N][C][=Branch1][=Branch1][=N][C][Ring1][S][=S][N]"}]