1. Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling, 712100 Shaanxi, People’s Republic of China
2. Provincial Key Laboratory of Agrobiology and Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, 210014 Nanjing, China
3. Dipartimento di Chimica e Chimica Industriale, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy