Using C[C@@H]1CC2(CC[C@@H]1N1CCC(Cc3ccc(Cl)cc3Cl)C1=O)OCCO2 to produce C[C@H]1CC(=O)CC[C@H]1N1CCC(Cc2ccc(Cl)cc2Cl)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.