[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a pyrimidine nucleoside."}, {"from": "gpt", "value": "[C][C][=C][N][Branch1][#Branch2][C][=Branch1][C][=O][N][C][Ring1][#Branch1][=O][C][C][Branch2][Ring1][#Branch2][C][Branch2][Ring1][Branch1][C][Branch1][Ring2][O][Ring1][Branch1][C][O][C][=Branch1][C][=O][C][=C][C][=C][C][=C][Ring1][=Branch1][O][O]"}]