Using CCOC(=O)c1cn(-c2ccc(Cl)cc2)c(-c2ccccc2Cl)n1 to produce O=Cc1cn(-c2ccc(Cl)cc2)c(-c2ccccc2Cl)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.