Nc1ncnc2cn[nH]c12    mol4915    0_1
[NH3+]c1ncnc2cn[nH]c12    mol4915    1_1
Nc1ncnc2c[nH+][nH]c12    mol4915    1_2
Nc1nc[nH+]c2cn[nH]c12    mol4915    1_3
Nc1[nH+]cnc2cn[nH]c12    mol4915    1_4
Nc1ncnc2cn[n-]c12    mol4915    -1_1