CC(C)C1=C(O)CCC1=O    mol31142    0_1
CC(C)C1=C([O-])CCC1=O    mol31142    -1_1
CC(C)C1=C(O)[CH-]CC1=O    mol31142    -1_2
CC(C)C1=C(O)C[CH-]C1=O    mol31142    -1_3