Using COC(=O)C1CCC(O)c2c(-c3ccc(Cl)cc3)noc2C1 to produce COC(=O)C1CCC(=O)c2c(-c3ccc(Cl)cc3)noc2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.