Using CCCC[Sn](CCCC)(CCCC)c1ccccc1, Nc1ccc(Br)cc1[N+](=O)[O-] to produce Nc1ccc(-c2ccccc2)cc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.