1. Key Laboratory of Synthetic and Natural Functional Molecule
Chemistry of Ministry of Education, College of Chemistry and Materials
Science, Northwest University, Xi’an 710127, P. R. China
2. Department of Biological Sciences, California State Polytechnic University, 3801 West Temple Avenue, Pomona, California 91768, United States
3. Department
of Pharmaceutical Sciences, College of Pharmacy, Western University of Health Sciences, 309 East Second Street, Pomona, California 91766, United States