Using COc1ccc2oc(=O)cc(Cl)c2c1, Oc1c(Cl)cccc1Cl to produce COc1ccc2oc(=O)cc(Oc3c(Cl)cccc3Cl)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.