1. Shaanxi Key Laboratory of Natural Products & Chemical Biology, Shaanxi Engineering Center of Bioresource Chemistry & Sustainable Utilization, College of Chemistry & Pharmacy, Northwest A&F University, Yangling 712100, People's Republic of China
2. College of Life Science, Northwest A&F University, Yangling 712100, People's Republic of China
3. College of Forestry, Northwest A&F University, Yangling 712100, People's Republic of China