O=C1C([O-])=C([O-])C(=O)C(O)=C1[O-]    mol9533    -3_1
O=C1C([O-])=C(O)C(=O)C(O)=C1O    mol9533    -1_1
O=C1C([O-])=C(O)C(=O)C([O-])=C1O    mol9533    -2_1
O=C1C([O-])=C(O)C(=O)C(O)=C1[O-]    mol9533    -2_2
O=C1C([O-])=C([O-])C(=O)C(O)=C1O    mol9533    -2_3