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