Clc1nc2ncncc2[nH]1 mol8276 0_1 Clc1[nH]c2cncnc2[nH+]1 mol8276 1_1 Clc1nc2nc[nH+]cc2[nH]1 mol8276 1_2 Clc1nc2[nH+]cncc2[nH]1 mol8276 1_3 Clc1nc2ncncc2[n-]1 mol8276 -1_1