[O-]c1c[nH+]c2ncccc2n1 mol1835 0_1 Oc1cnc2ncccc2n1 mol1835 0_2 [O-]c1cnc2[nH+]cccc2n1 mol1835 0_3 Oc1cnc2[nH+]cccc2n1 mol1835 1_1 [O-]c1c[nH+]c2[nH+]cccc2n1 mol1835 1_2 Oc1cnc2ncccc2[nH+]1 mol1835 1_3 Oc1c[nH+]c2ncccc2n1 mol1835 1_4 [O-]c1cnc2ncccc2n1 mol1835 -1_1