Using O=C(O)c1ccc(N2CC(F)(F)C2)c(OCC2CC2)n1, CCOC(=O)C1C2CNCC21 to produce CCOC(=O)C1C2CN(C(=O)c3ccc(N4CC(F)(F)C4)c(OCC4CC4)n3)CC21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.