Using O=C([O-])[O-], CC(C)(C)OC(=O)Nc1cccc(CC2CNCC2O)n1 to produce CC(C)(C)OC(=O)NCCN1CC(O)C(Cc2cccc(NC(=O)OC(C)(C)C)n2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.