Using CC(=O)Nc1cccc2c(Br)ccc(C)c12, O=[N+]=O to produce CC(=O)Nc1ccc([N+](=O)[O-])c2c(Br)ccc(C)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.