O=C([O-])c1c[nH]c[nH+]1    mol6654    0_1
O=C(O)c1c[nH]cn1    mol6654    0_2
O=C(O)c1c[nH]c[nH+]1    mol6654    1_1
O=C(O)c1c[n-]cn1    mol6654    -1_1
O=C([O-])c1c[nH]cn1    mol6654    -1_2