1. State Key Laboratory of Phytochemistry
and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201,
People’s Republic of China
2. Laboratory of Natural Products
Chemistry, Department of Chemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon
3. Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai
201203, People’s Republic of China