Author information:
(1)Department of Medicinal Chemisry, Key Laboratory of Chemical Biology 
(Ministry of Education), School of Pharmaceutical Sciences, Shandong University, 
Jinan 255012, China; Shandong Qidu Pharmaceutical Co. Ltd., Shandong Provincial 
Key Laboratory of Neuroprotective Drugs, Zibo 255400, China.
(2)Shandong Qidu Pharmaceutical Co. Ltd., Shandong Provincial Key Laboratory of 
Neuroprotective Drugs, Zibo 255400, China.
(3)Department of Medicinal Chemisry, Key Laboratory of Chemical Biology 
(Ministry of Education), School of Pharmaceutical Sciences, Shandong University, 
Jinan 255012, China.
(4)Department of Medicinal Chemisry, Key Laboratory of Chemical Biology 
(Ministry of Education), School of Pharmaceutical Sciences, Shandong University, 
Jinan 255012, China. Electronic address: xinyongl@sdu.edu.cn.