1. Department
of Natural Products Chemistry, Key Lab of Chemical Biology of Ministry
of Education, School of Pharmaceutical Science, Shandong University, Jinan 250012, People’s Republic of China
2. School
of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, People’s Republic of China
3. Guangxi Mount Maoer National Nature Reserve, Guilin 541001, People’s Republic of China
4. Natural
Products Research Laboratories, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599-7568, United States