CC1=C(C2=C(C)C(=O)C(O)=CC2=O)C(=O)C=C(O)C1=O    mol34935    0_1
CC1=C(C2=C(C)C(=O)C(O)=CC2=O)C(=O)C=C([O-])C1=O    mol34935    -1_1
[CH2-]C1=C(C2=C(C)C(=O)C(O)=CC2=O)C(=O)C=C(O)C1=O    mol34935    -1_2