Using Cc1ccc(C(=O)OC(C)(C)C)cc1Br, O=C(O)c1ccc(-c2ccc(Br)cc2)cc1 to produce CC(C)(C)OC(=O)c1ccc(-c2ccc(Br)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.