Using N#Cc1cnn(-c2nc(Cl)c(C(F)(F)F)cc2Cl)c1N, BrBr to produce N#Cc1cnn(-c2nc(Cl)c(C(F)(F)F)cc2Cl)c1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.