Using O=N[O-], Nc1cc(SCC2=C(C(=O)O)N3C(=O)C(NC(=O)CC(=O)CCl)[C@H]3SC2)nn2nnnc12 to produce Nc1cc(SCC2=C(C(=O)O)N3C(=O)C(NC(=O)C(=NO)C(=O)CCl)[C@H]3SC2)nn2nnnc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.