Using COc1ccc2nc(-c3cccc([N+](=O)[O-])c3)[nH]c(=O)c2c1 to produce O=c1[nH]c(-c2cccc([N+](=O)[O-])c2)nc2ccc(O)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.