1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
2. School of Pharmaceutical Sciences, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, P. R. China
3. Chemical Technology Research Institute of Shandong, Qingdao University of Science and Technology, Jinan 250014, P. R. China
4. Shouguang Fukang Pharmaceutical Co. Ltd., Weifang 262700, P. R. China
5. School of Pharmacy, Fudan University, Shanghai 201203, P. R. China