Using COC(=O)c1cc(OCc2ccccc2)c2c(Cl)cc(Cl)cc2n1 to produce O=C(O)c1cc(OCc2ccccc2)c2c(Cl)cc(Cl)cc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.