1. 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 100050 , China
2. Key Laboratory of Biosynthesis of Natural Products of National Health Commission of the People's Republic of China, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing 100050 , China
3. Department of Pharmacy, The Fourth Affiliated Hospital of China Medical University , Shenyang 100032 , China