O=C(O)c1c(F)c(F)c(F)c(F)c1C(=O)O    mol23035    0_1
O=C([O-])c1c(F)c(F)c(F)c(F)c1C(=O)O    mol23035    -1_1
O=C([O-])c1c(F)c(F)c(F)c(F)c1C(=O)[O-]    mol23035    -2_1