Using CC(C)(C)OC(=O)N1CCC(Nc2c(CO)cnc3ccc(Cl)nc23)CC1 to produce CC(C)(C)OC(=O)N1CCC(Nc2c(C=O)cnc3ccc(Cl)nc23)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.