C[C@H]1C(=O)O[C@@H](C(C)(C)C)C1=O    mol12543    0_1
C[C@H]1C(=O)O[C-](C(C)(C)C)C1=O    mol12543    -1_1
C[C-]1C(=O)O[C@@H](C(C)(C)C)C1=O    mol12543    -1_2