Using CCOC(=O)C=[N+]=[N-], O=Cc1cccc([N+](=O)[O-])c1 to produce CCOC(=O)CC(=O)c1cccc([N+](=O)[O-])c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.