1. School of Pharmaceutical Science and Technology (SPST), Faculty of Medicine, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, P. R. China
2. International Joint Research Centre for Molecular Sciences, Tianjin University, Tianjin 300072, China
3. Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
4. Department of Pharmaceutical and Biological Chemistry, University College London (UCL), School of Pharmacy, 29-39 Brunswick Square, Bloomsbury, London, WC1N 1AX, UK