1. Department of ChemistryTsinghua University Beijing 100084 P. R. China
2. The State Key Laboratory Breeding Base-Shenzhen Key Laboratory of Chemical Biology, the Graduate School at ShenzhenTsinghua University Shenzhen 518055 P. R. China
3. Bioinformatics and Drug Design Group, Department of PharmacyNational University of Singapore Singapore 117543 Singapore
4. Shenzhen Kivita Innovative Drug Discovery Institute Shenzhen 518055 P. R. China
5. School of Pharmaceutical SciencesTsinghua University Beijing 100084 P. R. China