Using CC(=O)[O-], CC(C)(C)OC(=O)C(c1ccc(CBr)cc1)C1CCCC1 to produce CC(=O)OCc1ccc(C(C(=O)OC(C)(C)C)C2CCCC2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.