CC(=O)C1=C(O)CCCC1    mol34321    0_1
CC(=O)C1=C(O)[CH-]CCC1    mol34321    -1_1
CC(=O)C1=C([O-])CCCC1    mol34321    -1_2
[CH2-]C(=O)C1=C(O)CCCC1    mol34321    -1_3