Using Clc1ccc(CBr)cc1Cl, O=C(O)C(O)c1ccc(O)cc1 to produce O=C(OCc1ccc(Cl)c(Cl)c1)C(O)c1ccc(OCc2ccc(Cl)c(Cl)c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.