A new entry to pyrazolo[4,3-e][1,4]diazepines. Facile synthesis of pyrazolo [4,3-e][1,4]diazepin-5,8-diones, 5,6,8-triones and pyrazolo[4,3-e]pyrrolo-[1,2-a][1,4]diazepin-5,10-diones

Abstract
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