1. Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest of China School of Chemistry and Chemical Engineering, and Basic Experimental Teaching Center, Shaanxi Normal University Shaanxi Normal University No.620 West Chang'an Avenue Xi'an 710119 China
2. Department of Molecular Medicine Beckman Research Institute of City of Hope Duarte California 91010 USA