1. College of Chemistry & Materials Engineering; Wenzhou University; Wenzhou 325035 P.R. China
2. Institute of Functional Biomolecules; State Key Laboratory of Pharmaceutical Biotechnology; Nanjing University; Nanjing 210093 P.R. China
3. Leibniz-Institut für Molekulare Pharmakologie (FMP); Robert-Roessle-Strasse 10 13125 Berlin Germany
4. Department of NMR-based Structural Biology; Max Planck Institute for Biophysical Chemistry; 37077 Göttingen Germany