Using CCCCC([SnH3])=C(CCCC)CCCC, O=[N+]([O-])c1ccc(F)c(Br)c1F to produce C=Cc1c(F)ccc([N+](=O)[O-])c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.