NC(=O)C([N+](=O)[O-])[N+](=O)[O-]    mol8941    0_1
NC(=O)[C-]([N+](=O)[O-])[N+](=O)[O-]    mol8941    -1_1
[NH-]C(=O)C([N+](=O)[O-])[N+](=O)[O-]    mol8941    -1_2