Using CCOC(=O)C1Cc2cc(C(=O)c3ccc(O)cc3)c(Cl)c(Cl)c2O1 to produce CCOC(=O)C1Cc2cc(Cc3ccc(O)cc3)c(Cl)c(Cl)c2O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.