O=C1C(O)=C(F)C(=O)C(O)=C1F    mol9610    0_1
O=C1C(O)=C(F)C(=O)C([O-])=C1F    mol9610    -1_1
O=C1C([O-])=C(F)C(=O)C([O-])=C1F    mol9610    -2_1