Using CCOC(=O)c1ccc2nc(Cc3ccccc3)n(Cc3ccc(Cl)cc3Cl)c2c1 to produce O=C(O)c1ccc2nc(Cc3ccccc3)n(Cc3ccc(Cl)cc3Cl)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.