Using COC(=O)c1cc2c3ccccc3n(Cc3cc(Cl)ccc3Cl)c2cn1 to produce OCc1cc2c3ccccc3n(Cc3cc(Cl)ccc3Cl)c2cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.