CC(C)(CC(=O)O)C(=O)O    mol33813    0_1
CC(C)(CC(=O)O)C(=O)[O-]    mol33813    -1_1
CC(C)(CC(=O)[O-])C(=O)O    mol33813    -1_2
CC(C)(CC(=O)[O-])C(=O)[O-]    mol33813    -2_1