Abstract
AbstractThe synthesis of new tetracyclic systems and new stable tautomers of known systems 11H‐ 13 and 10H‐imidazo[1, 2‐b]pyrazolo[4, 3‐d]‐s‐triazolo[3, 4‐f]pyridazine 16, 9H‐pyrazolo[3, 4‐d]bis‐s‐triazolo[4, 3‐6:5′,1‐f]‐pyridazine 15, 10H‐pyrazolo[3, 4‐d]bis‐s‐triazolo[4, 3‐b:3′,4′‐f]pyridazine 17, and 10H‐pyrazolo[4, 3‐d)bis‐s‐triazolo[4, 3‐6:5′,1′‐f]pvridazine 18 is described.
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