[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a pyrimidine 2',3'-dideoxyribonucleoside."}, {"from": "gpt", "value": "[C][C][=C][N][Branch1][#Branch2][C][=Branch1][C][=O][N][C][Ring1][#Branch1][=O][C][C][C][Branch2][Ring1][S][C][Branch1][Ring2][O][Ring1][Branch1][C][O][C@H1][C@@H1][Branch2][Ring1][C][C@H1][Branch1][#Branch2][O][C][Branch1][Branch1][C@@H1][Ring1][=Branch1][O][O][C][=Branch1][C][=O][O][O][N]"}]