Using CCOC(=O)Cn1c(=O)c(=O)[nH]c2cc([N+](=O)[O-])c(-n3cccc3)cc21 to produce O=C(O)Cn1c(=O)c(=O)[nH]c2cc([N+](=O)[O-])c(-n3cccc3)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.