Cc1[nH+]cnc2ncc([O-])nc12    mol4819    0_1
Cc1ncnc2[nH+]cc([O-])nc12    mol4819    0_2
Cc1nc[nH+]c2ncc([O-])nc12    mol4819    0_3
Cc1ncnc2ncc(O)nc12    mol4819    0_4
Cc1ncnc2ncc([O-])nc12    mol4819    -1_1