[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a pyrimidine nucleoside."}, {"from": "gpt", "value": "[C][N][C][=Branch1][C][=O][C][=C][N][Branch1][Branch1][C][Ring1][#Branch1][=O][C][C][Branch1][=N][C][Branch1][=Branch2][C][Branch1][Ring2][O][Ring1][Branch1][C][O][O][O]"}]