Using COc1cc(CNc2nc(C)nc(C)c2Cl)ccc1O, O=[N+]([O-])c1cnc2ccc(Cl)nn12 to produce COc1cc(CNc2nc(C)nc(C)c2Cl)ccc1Oc1ccc2ncc([N+](=O)[O-])n2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.