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