Using Oc1c(Cl)cc(Cl)cc1Cl, COC(=O)c1cc(Cl)ccc1[N+](=O)[O-] to produce COC(=O)c1cc(Oc2c(Cl)cc(Cl)cc2Cl)ccc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.