Using BrCc1ccccc1, CC(C)(C)OC(=O)NC1(C(=O)O)CCc2ccccc21 to produce CC(C)(C)OC(=O)NC1(C(=O)OCc2ccccc2)CCc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.