Using O=Cc1cc(Cl)ccc1C(F)(F)F, Nc1nc(Nc2cc(Cl)cc(Cl)c2)n[nH]1 to produce FC(F)(F)c1ccc(Cl)cc1CNc1nc(Nc2cc(Cl)cc(Cl)c2)n[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.