[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a pyrimidine 2'-deoxyribonucleoside that is uridine in which the hydroxy group at position 2' has been replaced by two fluoro substituents. It is a metabolite of the drug gemcitabine. It has a role as a marine xenobiotic metabolite. It is a pyrimidine 2'-deoxyribonucleoside and an organofluorine compound."}, {"from": "gpt", "value": "[C][=C][N][Branch1][#Branch2][C][=Branch1][C][=O][N][C][Ring1][#Branch1][=O][C][C][Branch1][=N][C@@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][Branch1][C][O][O][Branch1][C][F][F]"}]