Using C[Si](CCC([N+](=O)[O-])[N+](=O)[O-])(c1ccccc1)c1ccccc1 to produce C[Si](CCC(F)([N+](=O)[O-])[N+](=O)[O-])(c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.