1. Department of Natural Products Chemistry, School of Pharmaceutical
Sciences, Shandong University, No. 44 West
Wenhua Road, Jinan 250012, People's Republic of China
2. College of Life Sciences, Shandong Normal University, No. 88 East Wenhua Road, Jinan 250014,
People's Republic of China
3. School of Chemistry and Chemical Engineering, Shandong University, No. 27 Shanda Nanlu, Jinan 250100, People's
Republic of China