Using Cc1cc([N+](=O)[O-])c(OCC(=O)O)c[n+]1[O-], O=C([O-])[O-] to produce COC(=O)COc1c[n+]([O-])c(C)cc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.