Nc1nc(N)c([N+](=O)[O-])c(N)n1    mol7532    0_1
Nc1nc(N)c([N+](=O)[O-])c(N)[nH+]1    mol7532    1_1
Nc1nc(N)c([N+](=O)[O-])c([NH3+])n1    mol7532    1_2
Nc1nc([NH3+])nc(N)c1[N+](=O)[O-]    mol7532    1_3