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 University of the Chinese Academy of Sciences, Beijing 100039, People’s Republic of China, Institute of Materia Medica, Chinese Academy of Medical Sciences, Beijing 100050, People’s Republic of China, and Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, People’s Republic of China