Using CC(O)c1cc(C(F)(F)F)cc2cn(COCC[Si](C)(C)C)nc12, BrC(Br)(Br)Br to produce CC(Br)c1cc(C(F)(F)F)cc2cn(COCC[Si](C)(C)C)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.