Using COC(=O)C1(C)CCc2onc(-c3ccc(Cl)cc3)c2CC1 to produce CC1(C(=O)O)CCc2onc(-c3ccc(Cl)cc3)c2CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.