Using BrC(Br)(Br)Br, Cc1c(N(Cc2ccc(OC(F)(F)F)cc2)S(=O)(=O)CCO)nc2cc(C(F)(F)F)ccn12 to produce Cc1c(N(Cc2ccc(OC(F)(F)F)cc2)S(=O)(=O)CCBr)nc2cc(C(F)(F)F)ccn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.