Using O=C(CBr)OCc1ccccc1, Oc1ccc(Cl)cc1Cc1cc(Cl)ccc1O to produce O=C(COc1ccc(Cl)cc1Cc1cc(Cl)ccc1O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.