Using CCOC(=O)c1cnc2c3c(ccc2c1)C(=O)C([N+](=O)[O-])C=N3 to produce O=C(O)c1cnc2c3c(ccc2c1)C(=O)C([N+](=O)[O-])C=N3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.