[{"from": "human", "value": "Provide a description of this molecule. [C][O][C][C][Branch2][Ring1][#Branch1][O][C][Branch1][Branch1][C][Ring1][Branch1][O][N][C][=N][C][=C][Ring1][Branch1][N][=C][N][C][Ring1][=Branch1][=O][C][O]"}, {"from": "gpt", "value": "The molecule is a purine nucleoside."}]