Nc1cnc(C=O)c(N)n1    mol6778    0_1
Nc1nc([NH3+])cnc1C=O    mol6778    1_1
Nc1cnc(C=O)c([NH3+])n1    mol6778    1_2
Nc1cnc(C=O)c(N)[nH+]1    mol6778    1_3
Nc1c[nH+]c(C=O)c(N)n1    mol6778    1_4