Using CC(C)(C)OC(=O)N1CCC(c2ccc(NC(=O)c3ccc(Cl)cn3)cc2)C1 to produce O=C(Nc1ccc(C2CCNC2)cc1)c1ccc(Cl)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.