Using O=N[O-], CCOC(=O)CC(=O)Nc1ccc(Cl)cc1C(=O)c1ccccc1 to produce CCOC(=O)C(=NO)C(=O)Nc1ccc(Cl)cc1C(=O)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.