Oc1nc(O)nc(O)n1    mol2530    0_1
[O-]c1nc(O)[nH+]c(O)n1    mol2530    0_2
[O-]c1nc([O-])nc([O-])n1    mol2530    -3_1
[O-]c1nc(O)nc(O)n1    mol2530    -1_1
[O-]c1nc([O-])nc(O)n1    mol2530    -2_1