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In an attempt to search for more potent positive inotropic agents, a series of 2-(4-substitutedmethylpiperazin-1-yl)-N-(3,4-dihydro-3-oxo-2H-benzo[b][1,4]oxazin-7-yl)acetamides were synthesized and their positive inotropic activities were evaluated by measuring left atrium stroke volume on isolated rabbit heart preparations. Several compounds showed favorable activities compared with the standard...
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