Using O=[N+]([O-])c1c[nH]cn1, CCOC(=O)C(C)(C)Br to produce CCOC(=O)C(C)(C)n1cnc([N+](=O)[O-])c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.