1. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China; Graduate School of the Chinese Academy of Sciences, Beijing 100039, People's Republic of China; Yunnan Laboratory of Pharmacology for Natural Products, Kunming Medical College, Kunming 650031, Yunnan, People's Republic of China; and Department of Pharmacology, University of Valencia, 46100 Burjassot, Spain