Using Br, Cc1cn(-c2ccc(N)c(C(F)(F)F)c2)c(C)n1 to produce Cc1cn(-c2cc(Br)c(N)c(C(F)(F)F)c2)c(C)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.