Using FC(F)(Br)C(F)(F)CCBr, COC(=O)CS(=O)(=O)CCC(F)(F)F to produce COC(=O)C(CCC(F)(F)C(F)(F)Br)S(=O)(=O)CCC(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.