1. Department
of Natural Product Chemistry, Key Lab of Chemical Biology of Ministry
of Education, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, P. R. China
2. Department
of Medicinal Chemistry, Key Lab of Chemical Biology of Ministry of
Education, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, P. R. China
3. Shandong Qidu
Pharmaceutical Co. Ltd., Shandong Provincial Key Laboratory of Neuroprotective
Drugs, Zibo 255400, P. R. China
4. Department
of Biochemistry and Molecular Biology, School of Medicine, Shandong University, Jinan 250012, P. R. China