CCC(C(=O)O)=C(C)C(=O)O    mol9991    0_1
CCC(C(=O)[O-])=C(C)C(=O)O    mol9991    -1_1
CCC(C(=O)O)=C(C)C(=O)[O-]    mol9991    -1_2
CCC(C(=O)[O-])=C(C)C(=O)[O-]    mol9991    -2_1