1. School of Science, Shandong Jiaotong University, Jinan 250357 China
2. 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
3. School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China