Nc1nc(=O)cn[nH]1    mol9015    0_1
Nc1[nH]ncc(=O)[nH+]1    mol9015    1_1
Nc1nc(=O)c[nH+][nH]1    mol9015    1_2
[NH3+]c1nc(=O)cn[nH]1    mol9015    1_3