Using ClCc1ccc(Cl)cc1, CCOC(=O)c1cnc2cc(O)ccc2c1 to produce CCOC(=O)c1cnc2cc(OCc3ccc(Cl)cc3)ccc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.