The present invention relates to the field of pharmaceutical
chemistry and therapeutics, and particularly relates to an
optically active butylphthalide open-ring derivative as shown in the general formula I or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier, preparation methods thereof, pharmaceutical compositions containing the compounds, and medical application thereof, especially application in medicines for prevention and treatment of cardiovascular and cerebrovascular and improvement of heart and brain circulatory disturbance, antiplatelet aggregation medicines,
antithrombotic medicines, anti-ischemic medicines, anti-
dementia medicines, anti-atherosclerotic medicines, and medicines for anti-diabetes and complications thereof. Pharmacological experimental results show that the compounds have good anti-
platelet aggregation activity, anti-thrombotic activity, anti-ischemic activity and neuroprotective effects, and are clinically useful for the preparation of medicines for preventing or treating diseases associated with
platelet aggregation.