Using CCSc1nc(N)cc(=O)n1-c1ccc(OCC(F)(F)F)cc1, BrBr to produce CCSc1nc(N)c(Br)c(=O)n1-c1ccc(OCC(F)(F)F)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.