Using COc1cc([N+](=O)[O-])c(CC(=O)O)c([N+](=O)[O-])c1O to produce O=C(O)Cc1c([N+](=O)[O-])cc(O)c(O)c1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.