O=C(O)C(O)(C(=O)O)C1CCCCC1    mol10921    0_1
O=C([O-])C(O)(C(=O)O)C1CCCCC1    mol10921    -1_1
O=C([O-])C(O)(C(=O)[O-])C1CCCCC1    mol10921    -2_1