Using CC(C)(C)OC(=O)N1CCC(C(=O)N2CCN(C(=O)Nc3ccc(Cl)c(Cl)c3)CC2)C1 to produce O=C(Nc1ccc(Cl)c(Cl)c1)N1CCN(CC2CCNC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.