1. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People’s Republic of China
2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3. State Key Laboratory of Respiratory Disease, Guangzhou Medical University, Guangzhou 510120, People’s Republic of China
4. Department of Biochemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon