O=C([O-])CN(CCC(=O)O)[N+](=O)[O-]    mol33959    -1_1
O=C([O-])CC[NH+](CC(=O)[O-])[N+](=O)[O-]    mol33959    -1_2
O=C([O-])CCN(CC(=O)O)[N+](=O)[O-]    mol33959    -1_3
O=C([O-])CCN(CC(=O)[O-])[N+](=O)[O-]    mol33959    -2_1