1. Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan University, Kunming, Yunnan, P. R. China
2. Yunnan Key Laboratory of Research and Development for Natural Products, Yunnan University, Kunming, Yunnan, P. R. China
3. School of Pharmacy, Yunnan University, Kunming, Yunnan, P. R. China
4. School of Materials and Energy, Yunnan University, Kunming, Yunnan, P. R. China