1. The Engineering and Technology Center for Chinese Medicine Development of Henan Province, Henan University of Chinese Medicine, Zhengzhou, PR China
2. State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, PR China
3. H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, Pakistan