[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a (R*,R*)-diepoxybutane. It is an enantiomer of a (S,S)-diepoxybutane."}, {"from": "gpt", "value": "[C][C@@H1][Branch1][Ring2][O][Ring1][Ring1][C@H1][C][O][Ring1][Ring1]"}]