Using F[B-](F)(F)F, CC(C)(C)c1cc(C(C)(C)C)cc(C(C)(C)C)c1 to produce CC(C)(C)c1cc(C(C)(C)C)c(F)c(C(C)(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.