Using CCOC(=O)CC(=O)C1(c2ccc(Cl)cc2)CC1, BrCc1cccc(Oc2ccccc2)c1 to produce CCOC(=O)C(Cc1cccc(Oc2ccccc2)c1)C(=O)C1(c2ccc(Cl)cc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.