1. School of Traditional Chinese Materia Medica , Shenyang Pharmaceutical University , Shenyang 110016 , P.R. China
2. School of Pharmacy , Shenyang Pharmaceutical University , Shenyang 110016 , Liaoning Province, P.R. China
3. State Key Laboratory of Medicinal Resources , Chemistry and Molecular Engineering , Guangxi Normal University , Gui Lin 541006 , P.R. China