Using C=CC[Sn](CCCC)(CCCC)CCCC, O=[N+]([O-])c1c(NCc2ccccc2)cc(Br)nc1NCc1ccccc1 to produce C=CCc1cc(NCc2ccccc2)c([N+](=O)[O-])c(NCc2ccccc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.