1. Drug Discovery and Design Center; CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China
2. University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China
3. Department of Chemistry-BMC, Uppsala University, Box 576, SE-751 23 Uppsala, Sweden