Nc1ncnc2[nH]ncc12    mol4921    0_1
Nc1nc[nH+]c2[nH]ncc12    mol4921    1_1
Nc1ncnc2[nH][nH+]cc12    mol4921    1_2
Nc1[nH+]cnc2[nH]ncc12    mol4921    1_3
[NH3+]c1ncnc2[nH]ncc12    mol4921    1_4
Nc1ncnc2[n-]ncc12    mol4921    -1_1