Using ClC(Cl)=CCOc1cc(Cl)c(OCCCBr)c(Cl)c1, O=C(O)c1ccccc1 to produce O=C(OCCCOc1c(Cl)cc(OCC=C(Cl)Cl)cc1Cl)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.