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Two series of N-(1-oxo-1,2,4,5-tetrahydro-[1,2,4]triazolo[4,3-a]quinolin-7-yl)acetamides bearing piperazine and 1,4-diazepane moieties were synthesized and screened for their positive inotropic activity by measuring left atrium stroke volume on isolated rabbit heart preparations. Most of the derivatives exhibited better in vitro positive inotropic activity than the existing drug, milrinone, among...
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