Using CC(C)(C)OC(=O)N1CCN(CC(=O)O)CC1, Nc1nccs1 to produce CC(C)(C)OC(=O)N1CCN(CC(=O)Nc2nccs2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.