CC(=O)C(C(C)=O)=C(C)O    mol31147    0_1
[CH2-]C(=O)C(C(C)=O)=C(C)O    mol31147    -1_1
[CH2-]C(O)=C(C(C)=O)C(C)=O    mol31147    -1_2
CC(=O)C(C(C)=O)=C(C)[O-]    mol31147    -1_3