CC(=O)/C(C)=C(/C)O    mol31107    0_1
CC(=O)/C(C)=C(/C)[O-]    mol31107    -1_1
[CH2-]/C(O)=C(\C)C(C)=O    mol31107    -1_2
[CH2-]C(=O)/C(C)=C(/C)O    mol31107    -1_3