Using CON(C)C(C)=O, CC(C)(C)[Si](C)(C)OC(c1cnc(Br)s1)C(F)(F)F to produce CC(=O)c1ncc(C(O[Si](C)(C)C(C)(C)C)C(F)(F)F)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.