Using CCOC(CBr)OCC, Oc1cc(Cl)c(OCc2ccccc2Cl)c(Cl)c1 to produce CCOC(COc1cc(Cl)c(OCc2ccccc2Cl)c(Cl)c1)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.