O=C(O)/C=C(\Cl)C(=O)O    mol22541    0_1
O=C([O-])/C=C(\Cl)C(=O)O    mol22541    -1_1
O=C(O)/C=C(\Cl)C(=O)[O-]    mol22541    -1_2
O=C([O-])/C=C(\Cl)C(=O)[O-]    mol22541    -2_1