O=C([O-])[C@@H]1C[NH2+]C[C@H](C(=O)O)C1    mol33245    0_1
O=C(O)[C@@H]1CNC[C@H](C(=O)O)C1    mol33245    0_2
O=C(O)[C@@H]1C[NH2+]C[C@H](C(=O)O)C1    mol33245    1_1
O=C(O)[C@@H]1CNC[C@H](C(O)=[OH+])C1    mol33245    1_2