Nc1ncc(Cl)c(N)n1    mol7257    0_1
Nc1nc([NH3+])ncc1Cl    mol7257    1_1
Nc1ncc(Cl)c([NH3+])n1    mol7257    1_2
Nc1nc(N)c(Cl)c[nH+]1    mol7257    1_3
Nc1ncc(Cl)c(N)[nH+]1    mol7257    1_4