Using [N-]=[N+]=[N-], CC1(C)OC(=O)C=C(CC(=O)CCl)O1 to produce CC1(C)OC(=O)C=C(CC(=O)CN=[N+]=[N-])O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.