Using OB(O)c1cccc(C(F)(F)F)c1, COC(=O)c1ccc(CBr)cc1 to produce COC(=O)c1ccc(Cc2cccc(C(F)(F)F)c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.