Using Br, CC(C)NC1=NS(=O)(=O)c2ccc(C(F)(F)F)cc2N1 to produce CC(C)NC1=NS(=O)(=O)c2cc(Br)c(C(F)(F)F)cc2N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.