Using CCOC(=O)C1=CNCCc2c1[nH]c1ccccc21, O=[N+]([O-])O to produce CCOC(=O)C1=CNCCc2c1[nH]c1cc([N+](=O)[O-])ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.