Using O=N[O-], CCOC(=O)C(=O)CC(=O)c1c(C)cc(C)cc1C to produce CCOC(=O)C(=O)C(=NO)C(=O)c1c(C)cc(C)cc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.