1. Department of Chemistry, University of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 China
2. State Key Laboratory of Bio‐organic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
3. Key Laboratory of Metabolism and Molecular Medicine, the Ministry of Education, Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University Shanghai 200032 China
4. Department of Medicinal Chemistry, China Pharmaceutical University 639 Longmian Avenue Nanjing Jiangsu 211198 China