1. State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100083, People's Republic of China, Guangdong Key Laboratory of Marine Materia Medica, Chinese Academy of Sciences, Guanzhou 510301, People's Republic of China, Analytical and Testing Center, Beijing Normal University, Beijing 100073, People's Republic of China, and Institute of Pharmaceutical Biology and Biotechnology, Heinrich-Heine University, 40225 Duesseldorf, Germany