[{"from": "human", "value": "Provide a description of this molecule. [C][C][Branch2][Ring1][=Branch2][C][Branch2][Ring1][Ring1][O][C][Ring1][Branch1][N][C][=N][C][=C][Ring1][Branch1][N][=C][N][C][Ring1][=Branch1][=O][C][O][O]"}, {"from": "gpt", "value": "The molecule is a purine 2'-deoxyribonucleoside."}]