Using [N-]=[N+]=[N-], CC(C)(C)OC(=O)N1CCOC(c2ccc(Cl)c(Cl)c2)C2(CO2)C1 to produce CC(C)(C)OC(=O)N1CCOC(c2ccc(Cl)c(Cl)c2)C(O)(CN=[N+]=[N-])C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.