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Structures of 1,2,3-triazole-fused pyrazines and pyridazines: 1H-1,2,3-triazolo[4,5-b]pyrazine (2); 1H-1,2,3-triazolo[4,5-c]pyridazine (4); 1H-1,2,3-triazolo[4,5-d]pyridazine (6); 1,2,3-triazolo[1,5-a]pyrazine (8); 1,2,3-triazolo[1,5-b]pyridazine (10); common precursors 1, 3, 5, 7, 9.
