Using CC(C)(C)OC(=O)N1C2CCC1CC(NC(=O)OCc1cc(Cl)cc(Cl)c1)C2 to produce O=C(NC1CC2CCC(C1)N2)OCc1cc(Cl)cc(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.