Using COC(=O)c1cc(OC)ccc1Oc1cc(Cl)ccc1[N+](=O)[O-] to produce COc1ccc(Oc2cc(Cl)ccc2[N+](=O)[O-])c(C(=O)O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.