O=[N+]([O-])c1n[nH]c(O)n1    mol25325    0_1
O=[N+]([O-])c1nc([O-])[nH][nH+]1    mol25325    0_2
O=[N+]([O-])c1n[nH]c([O-])n1    mol25325    -1_1
O=[N+]([O-])c1n[n-]c(O)n1    mol25325    -1_2