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Wiktionary
pyrazolopyrimidine

n. (context chemistry English) Any of a class of sedative and anxiolytic drugs with similar effects to benzodiazepines, their molecules typified by the linked six-sided pyrimidine ring and five-sided pyrazole ring.

Wikipedia
Pyrazolopyrimidine

Pyrazolopyrimidines are a series of isomeric heterocyclic chemical compounds with the molecular formula CHN. They form the central core of a variety of more complex chemical compounds including some pharmaceuticals and pesticides.