O=C(O)CC(CC(=O)O)OC(=O)O    mol33011    0_1
O=C([O-])CC(CC(=O)[O-])OC(=O)[O-]    mol33011    -3_1
O=C([O-])CC(CC(=O)O)OC(=O)O    mol33011    -1_1
O=C(O)CC(CC(=O)O)OC(=O)[O-]    mol33011    -1_2
O=C([O-])CC(CC(=O)[O-])OC(=O)O    mol33011    -2_1
O=C([O-])CC(CC(=O)O)OC(=O)[O-]    mol33011    -2_2