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