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