NC1=[NH+]Cc2cc([O-])c([O-])cc2N1    mol20849    -1_1
NC1=NCc2cc([O-])c(O)cc2N1    mol20849    -1_2
NC1=NCc2cc(O)c([O-])cc2N1    mol20849    -1_3
NC1=NCc2cc([O-])c([O-])cc2N1    mol20849    -2_1