Using O=C(Nc1ccncc1F)c1cnc2c(Br)cc(Cl)nn12, Nc1ccc(F)cn1 to produce O=C(Nc1ccncc1F)c1cnc2c(Nc3ccc(F)cn3)cc(Cl)nn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.