Using CC(C)(C)OC(=O)n1c(Br)ccc1Br, O=C(Cl)OCc1ccccc1 to produce CC(C)(C)OC(=O)n1c(Br)ccc1C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.