Using O=C(O)c1cc2cc(OCCN3CCCC3)ccc2o1, COC(=O)c1ccc(OCCN)cc1 to produce COC(=O)c1ccc(OCCNC(=O)c2cc3cc(OCCN4CCCC4)ccc3o2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.