Using OB(O)c1ccc(F)c(F)c1, Cc1ccc(Br)cc1C1=C(O)C2(CCC(F)(F)CC2)NC1=O to produce Cc1ccc(-c2ccc(F)c(F)c2)cc1C1=C(O)C2(CCC(F)(F)CC2)NC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.