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  • Title: 1H-pyrazolo[2,3-d][1,2,4]triazine-3,7-diones as a new class of human leukocyte elastase inhibitors.
    Author: Baraldi PG, Cacciari B, Romagnoli R, Spalluto G.
    Journal: Arzneimittelforschung; 1999 Dec; 49(12):997-1000. PubMed ID: 10635444.
    Abstract:
    A novel series of 1H-2-phenyl-substituted-pyrazolo[2,3-d][1,2,4]triazine-3,7-diones (3a-g) as potential inhibitors of Human Leukocyte Elastase (HLE) are reported, the acyl-pyrazole being probably involved in the inhibition mechanism of the serino-protease enzymes. The most potent inhibitor both in vivo and in vitro was 2-o-methoxyphenyl-5-methyl-6-nitro-pyrazolo[2,3-d][1,2,4]triazine-3,7-di one (3e), which significantly suppressed the HLE-induced pulmonary injury in rats when administered orally (100 mg/kg, 3 h prior to HLE administration.
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