O=C([O-])c1nncnc1O    mol36736    -1_1
O=C([O-])c1n[nH+]cnc1[O-]    mol36736    -1_2
O=C(O)c1nncnc1[O-]    mol36736    -1_3
O=C([O-])c1[nH+]ncnc1[O-]    mol36736    -1_4
O=C([O-])c1nncnc1[O-]    mol36736    -2_1