Nc1ncc(Br)c(N)n1    mol7250    0_1
Nc1ncc(Br)c(N)[nH+]1    mol7250    1_1
Nc1nc(N)c(Br)c[nH+]1    mol7250    1_2
Nc1nc([NH3+])ncc1Br    mol7250    1_3
Nc1ncc(Br)c([NH3+])n1    mol7250    1_4