O=[N+]([O-])C(CO)[N+](=O)[O-]    mol8950    0_1
O=[N+]([O-])C(C[O-])[N+](=O)[O-]    mol8950    -1_1
O=[N+]([O-])[C-](CO)[N+](=O)[O-]    mol8950    -1_2