1. Department of Natural Product Chemistry, Key Lab of Chemical Biology of Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, People’s Republic of China
2. School of Pharmacy, Linyi University, Linyi 276000, People’s Republic of China
3. Vitamin D Research Institute, Shaanxi University of Technology, Hanzhong 723000, People’s Republic of China
4. Nature Department, Shandong Museum, Jinan 250014, People’s Republic of China