Using O=[N+]([O-])c1c[nH]nc1Cl, CCOC(=O)C(C)(C)Br to produce CCOC(=O)C(C)(C)n1cc([N+](=O)[O-])c(Cl)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.