Using BrBr, CC(C)(C)C(=O)Nc1ccccc1-c1ccnc(C(F)(F)F)n1 to produce CC(C)(C)C(=O)Nc1ccc(Br)cc1-c1ccnc(C(F)(F)F)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.