Using CC(=O)OC1CCc2c1ncnc2N1CCN(C(=O)OC(C)(C)C)CC1 to produce CC(C)(C)OC(=O)N1CCN(c2ncnc3c2CCC3O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.