1. School of Chemical Science and Technology, Yunnan University, Kunming 650091, People’s Republic of China
2. College of Pharmaceutical Engineering, Xinyang Agricultural and Forestry University, Henan, 464000, People’s Republic of China
3. Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Research & Development Center for Natural Products, Yunnan University, Kunming 650091, People’s Republic of China