Using COC(=O)Cc1cc(OCCCCOc2ccccc2)ccc1Nc1c(Cl)cccc1Cl to produce O=C(O)Cc1cc(OCCCCOc2ccccc2)ccc1Nc1c(Cl)cccc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.