1. State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Lu, Shanghai 201203, China, and Chinese National Center for Drug Screening, Shanghai Institute of Materia Medica, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, 189 Guo-Shou-Jing Road, Shanghai 201203, China