Using O=Cc1cccc(Br)n1, OB(O)c1ccc(C(F)(F)F)cc1C(F)(F)F to produce O=Cc1cccc(-c2ccc(C(F)(F)F)cc2C(F)(F)F)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.