Using CC(O)c1ccccc1N, CC(C)(C)OC(=O)N1CCC(=O)CC1 to produce CC(O)c1ccccc1NC1CCN(C(=O)OC(C)(C)C)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.