Using O=N[O-], COc1ccc(-c2cn3ccccc3n2)c2c1NC(=O)CC2 to produce COc1ccc(-c2nc3ccccn3c2N=O)c2c1NC(=O)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.