CC(=CC(=O)O)C(=O)O    mol38513    0_1
CC(=CC(=O)[O-])C(=O)O    mol38513    -1_1
CC(=CC(=O)O)C(=O)[O-]    mol38513    -1_2
CC(=CC(=O)[O-])C(=O)[O-]    mol38513    -2_1