Using CCOC(=O)c1nc(-c2ccc(Cl)cc2)n(-c2ccccc2Cl)c1C=COC to produce CCOC(=O)c1nc(-c2ccc(Cl)cc2)n(-c2ccccc2Cl)c1CC=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.