C[C@H]1C[C@H](C)C(=O)CC1=O    mol12906    0_1
C[C-]1C[C@H](C)C(=O)CC1=O    mol12906    -1_1
C[C@H]1C[C@H](C)C(=O)[CH-]C1=O    mol12906    -1_2