1. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, Yunnan, People’s Republic of China, Shanghai Institute of Materia Medica, Shanghai Institute for Biological Science, Chinese Academy of Sciences, Shanghai 201203, People’s Republic of China, and School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 610075, Sichuan, People’s Republic of China