Tricyclic heteroaromatic systems containing a bridgehead nitrogen atom. Part 3. [1,2,4]Triazolo[3?,4? : 3,2]pyrazolo[3,4-d]pyrimidines, tetrazolo[1?,5? : 1,5]pyrazolo[3,4-d]pyrimidines and pyrimido-[5?,4? : 4,5]pyrazolo[3,2-c][1,2,4]triazines

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