Using FC(F)(F)c1ccncc1Br, O=C1NCCc2cc(Cl)c(C(F)(F)F)cc21 to produce O=C1c2cc(C(F)(F)F)c(Cl)cc2CCN1c1cnccc1C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.