Using CC(=O)O[C@H]1CC[C@@]2(C)C(=C[C@@H](Br)[C@@H]3[C@@H]2CC[C@]2(C)C(=O)CC[C@@H]32)C1, O=C([O-])O to produce COC1C=C2C[C@@H](OC(C)=O)CC[C@]2(C)[C@H]2CC[C@]3(C)C(=O)CC[C@H]3[C@H]12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.