1. Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China, Open Laboratory of Chirotechnology, Institute of Molecular Technology for Drug Discovery and Synthesis, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, China, and School of Chemistry and Biotechnology, Yunnan Nationalities University, Kunming 650031, China