O=[N+]([O-])c1cc2nc[nH]c2cc1[N+](=O)[O-]    mol15696    0_1
O=[N+]([O-])c1cc2[nH]c[nH+]c2cc1[N+](=O)[O-]    mol15696    1_1
O=[N+]([O-])c1cc2nc[n-]c2cc1[N+](=O)[O-]    mol15696    -1_1