1. School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, China
2. Qinghai Provincial Key Laboratory of Tibetan Medicine Research and Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Qinghai 810008, China
3. College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China
4. College of Chemistry & Chemical Engineering, Shenyang Normal University, Shenyang, Liaoning 110034, P. R. China