Using Cc1cnc(-c2ccc([N+](=O)[O-])cc2)o1, NC(=O)CCC(=O)NBr to produce O=[N+]([O-])c1ccc(-c2ncc(CBr)o2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.