Using CCCC[Sn](CCCC)(CCCC)c1ccccn1, CC(=O)Nc1c(Br)cccc1[N+](=O)[O-] to produce CC(=O)Nc1c(-c2ccccn2)cccc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.