Using O=C1CCC(=O)O1, CC(C)(C)OC(=O)NCc1ccc(CN)cc1 to produce CC(C)(C)OC(=O)NCc1ccc(CNC(=O)CCC(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.