Using CI, O=c1[nH]c2cc([N+](=O)[O-])ccc2c(=O)o1 to produce Cn1c(=O)oc(=O)c2ccc([N+](=O)[O-])cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.