Using C[C@@H]1CC[C@@]2(OC1)O[C@H]1C[C@H]3[C@@H]4CC[C@H]5CC(=O)[C@H](Br)C[C@]5(C)[C@H]4CC[C@]3(C)[C@H]1[C@@H]2C to produce C[C@@H]1CC[C@@]2(OC1)O[C@H]1C[C@H]3[C@@H]4CC[C@H]5CC(=O)C=C[C@]5(C)[C@H]4CC[C@]3(C)[C@H]1[C@@H]2C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.