Cn1nnc(N[N+](=O)[O-])n1    mol13012    0_1
Cn1n[nH+]c(N[N+](=O)[O-])n1    mol13012    1_1
Cn1nc(N[N+](=O)[O-])n[nH+]1    mol13012    1_2
Cn1nnc(N[N+](=O)[O-])[nH+]1    mol13012    1_3
Cn1nnc([NH2+][N+](=O)[O-])n1    mol13012    1_4
Cn1nnc([N-][N+](=O)[O-])n1    mol13012    -1_1