Using O=[N+]([O-])c1ccc(Nc2ncc(Br)c(Nc3ccccc3)n2)cc1 to produce Nc1ccc(Nc2ncc(Br)c(Nc3ccccc3)n2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.