Using O=C([O-])[O-], NC(=O)c1c(O)ncn1Cc1ccc([N+](=O)[O-])cc1 to produce COc1ncn(Cc2ccc([N+](=O)[O-])cc2)c1C(N)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.