O=C(O)[C@@H]1CCN[C@H](C(=O)[O-])C1    mol36320    -1_1
O=C([O-])[C@@H]1CC[NH2+][C@H](C(=O)[O-])C1    mol36320    -1_2
O=C([O-])[C@@H]1CCN[C@H](C(=O)O)C1    mol36320    -1_3
O=C([O-])[C@@H]1CCN[C@H](C(=O)[O-])C1    mol36320    -2_1