Using COCc1cccc2c1CN1CC(=O)NC1=N2, O=[N+]([O-])O to produce COCc1c([N+](=O)[O-])ccc2c1CN1CC(=O)NC1=N2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.