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Reactions with Hydrazonoyl Halides 60 1 : Synthesis of Thieno[2′,3′:4,5] Pyrimidino[1,2- b ][1,2,4,5]tetrazines,[1]benzothieno[2′,3′:4,5]pyrimidino [1,2- b ][1,2,4,5]tetrazines,Pyrazolo[3′,4′:4,5]pyrimidino[1,2- b ] [1,2,4,5]tetrazines and Pyrazolo[3,4- d ]pyridazines