[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a bifunctional hexitol derivative with potential antineoplastic activity. Dianhydrogalactitol alkylates and cross-links DNA via an epoxide group during all phases of the cell cycle, resulting in disruption of DNA function and cell cycle arrest. (NCI04)"}, {"from": "gpt", "value": "[C][C@@H1][Branch1][Ring2][O][Ring1][Ring1][C@@H1][Branch1][#Branch2][C@@H1][Branch1][=Branch1][C@@H1][C][O][Ring1][Ring1][O][O]"}]