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