O=C(O)[C@H]1C[C@@H](C(=O)O)C1    mol32980    0_1
O=C([O-])[C@H]1C[C@@H](C(=O)O)C1    mol32980    -1_1
O=C([O-])[C@H]1C[C@@H](C(=O)[O-])C1    mol32980    -2_1