a kind of isoflavone compound extracted from roots of wild kudzu, Improve microcirculation,dilate coronary artery, increase blood stream volume of brain and coronary artery, reduce heart rate, reduce index of myocardial oxygen consumption as to inproce the metabolism of ischemic myocarduum.it also has functions of resisting thrombus, raising the high-density lipoprotein,resisting vasospasm, and reducing platelet aggregation.