O=C([O-])C[C@H](C(=O)[O-])n1cc[nH+]c1    mol18496    -1_1
O=C([O-])C[C@H](C(=O)O)n1ccnc1    mol18496    -1_2
O=C(O)C[C@H](C(=O)[O-])n1ccnc1    mol18496    -1_3
O=C([O-])C[C@H](C(=O)[O-])n1ccnc1    mol18496    -2_1