Clc1cc2nccnc2cn1 mol8022 0_1 Clc1cc2nccnc2c[nH+]1 mol8022 1_1 Clc1cc2[nH+]ccnc2cn1 mol8022 1_2 Clc1cc2ncc[nH+]c2cn1 mol8022 1_3