1. Xiangya International Academy of Translational Medicine; Central South University, Changsha, Hunan 410013; China
2. Hunan Engineering Research Center of Combinatorial Biosynthesis and Natural Product Drug Discovery, Changsha; Hunan 410205 China
3. Departments of Chemistry and Molecular Medicine, and Natural Products Library Initiative at The Scripps Research Institute, The Scripps Research Institute; Jupiter, FL 33458 USA
4. National Engineering Research Center of Combinatorial Biosynthesis for Drug Discovery, Changsha; Hunan 410205 China