Using CCOC(=O)CBr, O=C1Oc2ccc(Cl)cc2C1c1ccccc1 to produce CCOC(=O)CC1(c2ccccc2)C(=O)Oc2ccc(Cl)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.