The compounds have multiple mechanisms or functions, for example, inhibition of monoamine oxidase and cholinesterase, scavenging of free radicals, and protection of cells such as nerve cells. The compounds can be used for manufacture of medicaments of cell protection, for prevention and/or treatment of monoamine oxidase, cholinesterase and free radicals related diseases, for example, neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease and stroke, and free-radical related diseases such as heart disease, myocardial ischemia, diabetes and other cardiovascular and cerebrovascular diseases.
