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ZJM-289 is a potent racemic agent which inhibits both platelet aggregation and thrombosis superior to a known anti-ischemic stroke drug 3-n-butylphthalide (NBP).1 Herein,synthesis and biological evaluation of the enantiomers of ZJM-289 are described.It was observed that the two enantiomers,(S)-ZJM-289 and(R)-ZJM-289,appeared to be almost as effective as ZJM-289 in inhibiting adenosine diphosphate (ADP),thrombin(TH) and arachidonic acid(AA) induced platelet aggregation in vitro and thrombus formation in rats,and in protecting against collagen and adrenaline-induced thrombosis in mice.