CC1=CC(=O)C(C)=C(O)C1=O    mol30526    0_1
[CH2-]C1=C(O)C(=O)C(C)=CC1=O    mol30526    -1_1
[CH2-]C1=CC(=O)C(C)=C(O)C1=O    mol30526    -1_2
CC1=CC(=O)C(C)=C([O-])C1=O    mol30526    -1_3