Using Nc1ccc(N2CCOCC2=O)cc1, COC(=O)c1ccc2[nH]nc(C(=O)O)c2c1 to produce COC(=O)c1ccc2[nH]nc(C(=O)Nc3ccc(N4CCOCC4=O)cc3)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.