1. State Key Laboratory of Medicinal Chemical BiologyCollege of PharmacyNankai University Tianjin 300071 China
2. College of ChemistryNankai University Tianjin 300071 China
3. Department of ChemistryUniversity of South Florida 4202 E. Fowler Avenue Tampa FL 33620 USA
4. School of Food Science and Pharmaceutical EngineeringNanjing Normal University No. 1 Wenyuan Road Nanjing 210046 China
5. National Institute for Advanced MaterialsNankai University Tianjin 300071 China