[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a pyrimidine 2'-deoxyribonucleoside."}, {"from": "gpt", "value": "[C][C][Branch2][Ring1][O][C][Branch2][Ring1][Branch1][O][C][Ring1][Branch1][N][C][=C][Branch1][#Branch2][C][=Branch1][=Branch1][=N][C][Ring1][=Branch1][=O][N][C][O][C][O][O]"}]