[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a pyrimidine nucleoside."}, {"from": "gpt", "value": "[C][C][=C][N][Branch1][#Branch2][C][=Branch1][C][=S][N][C][Ring1][#Branch1][=O][C][C][Branch1][=N][C][Branch1][=Branch2][C][Branch1][Ring2][O][Ring1][Branch1][C][O][O][O]"}]