1. College
of Chemistry, Beijing Normal University, 100875 Beijing, China
2. Department
of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
3. National Institute for Food and Drug Control, Institute of Chemical Drug Control, TianTanXiLi 2, Beijing, 100050, China
4. Department
of Chemistry, Northern Illinois University, DeKalb, Illinois 60115, United States