Using COc1cc(C(=O)Cl)cc(OC)c1OC, COc1ccc(Br)c(OC)c1OC to produce COc1cc(C(=O)c2ccc(OC)c(OC)c2OC)cc(OC)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.