Using CN1C(=O)C(C)(C)c2cc(F)c(N)c(F)c21, O=C(O)c1ccncc1 to produce CN1C(=O)C(C)(C)c2cc(F)c(NC(=O)c3ccncc3)c(F)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.