Nc1nc[nH]n1    mol7657    0_1
Nc1nc[nH][nH+]1    mol7657    1_1
[NH3+]c1nc[nH]n1    mol7657    1_2
Nc1n[nH]c[nH+]1    mol7657    1_3
Nc1nc[n-]n1    mol7657    -1_1