NCc1c[nH]cn1    mol3903    0_1
[NH3+]Cc1c[nH]cn1    mol3903    1_1
NCc1c[nH]c[nH+]1    mol3903    1_2
[NH3+]Cc1c[nH]c[nH+]1    mol3903    2_1
NCc1c[n-]cn1    mol3903    -1_1