1. College of Pharmacy; The State Key Laboratory of Medicinal Chemical Biology; Nankai University; No. 94 Weijin Road 300071 Tianjin Nankai District China
2. School of Pharmaceutical Science and Technology; Tianjin University; No. 92 Weijin Road 300072 Tianjin Nankai District China
3. School of Chemistry; University of Nottingham; University Park NG7 2RD Nottingham UK