O=C([O-])CC(CC(=O)O)n1ccnc1    mol18493    -1_1
O=C([O-])CC(CC(=O)[O-])n1cc[nH+]c1    mol18493    -1_2
O=C([O-])CC(CC(=O)[O-])n1ccnc1    mol18493    -2_1