Recently, the gradually increased incidence of Alzheimer's disease brings serious economic and mental burden to patients, their families, and society. However, the current clinical drugs can only delay the development of the disease, and not completely cure Alzheimer's disease. And most of the drugs have many side effects. Therefore, it is essential to develop low toxic and effective drugs to prevent and treatment Alzheimer's disease. One of the main pathological features of Alzheimer's disease is substanti...