Using CCOC(=O)C1(CCNc2cnc(Cl)nc2)CCN(C(=O)OC(C)(C)C)CC1 to produce CC(C)(C)OC(=O)N1CCC2(CC1)CCN(c1cnc(Cl)nc1)C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.