1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
2. U.S. Department of Agriculture, Natural Products Utilization Research Unit, Agricultural Research Service, P.O. Box 1848, University, Mississippi 38677, United States
3. National Center for Natural Product Research, School of Pharmacy, University of Mississippi, P.O. Box 1848, University, Mississippi 38677, United States