1. School of Chemical Science and Technology, Key Laboratory of Medicinal Chemistry for Natural Resource-Ministry of Education, Yunnan University, 2 North Cuihu Road, Kunming 650091, PR China
2. School of Materials and Energy, Yunnan University, Kunming 650091, PR China
3. Laboratory for Conservation and Utilization of Bio-Resource, Yunnan University, 2 North Cuihu Road, Kunming 650091, PR China