Using C[Si](Cn1cncn1)(c1ccc(F)cc1)c1ccc(F)cc1, II to produce C[Si](Cn1ncnc1I)(c1ccc(F)cc1)c1ccc(F)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.