1. State Key Laboratory of Applied
Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000, China
2. Product Development, GlaxoSmithKline, Inc., 709 Swedeland Road, King of
Prussia, Pennsylvania 19406, United States
3. Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United
States