Using CCOC(=O)CBr, O=C1c2c(cc(O)c(Cl)c2Cl)CC1c1ccccc1 to produce CCOC(=O)COc1cc2c(c(Cl)c1Cl)C(=O)C(c1ccccc1)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.