O=C([O-])C[NH+](CC(=O)O)[N+](=O)[O-]    mol9201    0_1
O=C(O)CN(CC(=O)O)[N+](=O)[O-]    mol9201    0_2
O=C([O-])CN(CC(=O)O)[N+](=O)[O-]    mol9201    -1_1
O=C([O-])C[NH+](CC(=O)[O-])[N+](=O)[O-]    mol9201    -1_2
O=C([O-])CN(CC(=O)[O-])[N+](=O)[O-]    mol9201    -2_1