1. School of Vocational and Technical Education; Yunnan Normal University; Kunming 650092, PR China
2. School of Chemical Science and Technology; Yunnan University, Kunming; 650091, PR China
3. Department of Biology; College of Letters & Sciences; Columbus State University; University System of Georgia, Columbus, GA; USA.
4. Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province; School of Science; Honghe University, Mengzi, Yunnan; 661199, PR China