Using CI, O=C1NC(=O)c2cc(Oc3ccc([N+](=O)[O-])cc3)ccc21 to produce CN1C(=O)c2ccc(Oc3ccc([N+](=O)[O-])cc3)cc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.