Using CC(C)[Si](O[C@H]1CCN(C(=O)OC(C)(C)C)C1=O)(C(C)C)C(C)C, Fc1cccc(Br)c1 to produce CC(C)[Si](O[C@H]1CCN(C(=O)OC(C)(C)C)C1(O)c1cccc(F)c1)(C(C)C)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.