Using O=C(c1ccc(Cl)cc1)c1cccc(C(C(=O)O)C(=O)O)c1[N+](=O)[O-] to produce O=C(O)Cc1cccc(C(=O)c2ccc(Cl)cc2)c1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.