1. Key Laboratory of Biomedical Information Engineering of the Ministry of Education; School of Life Science and Technology; Xi'an Jiaotong University; Xi'an 710049 P. R. China
2. Department of Chemistry; School of Science; Xi'an Jiaotong University; Xi'an 710049 P. R. China
3. Shaanxi Key Laboratory of Ischemic Cardiovascular Disease; Shaanxi Key Laboratory of Brain Disorders; Institute of Basic and Translational Medicine; Xi'an Medical University; Xi'an 710021 Shaanxi, China