[1] Beijing Inst Pharmacol & Toxicol, Beijing 100850, Peoples R China
[2] Univ N Carolina, Nat Prod Res Labs, UNC Eshelman Sch Pharm, Chapel Hill, NC 27599 USA
[3] NCI, Screening Technol Branch, Dev Therapeut Program, Div Canc Treatment & Diag,NIH, Frederick, MD 21702 USA
[4] Univ N Carolina, Div Chem Biol & Med Chem, UNC Eshelman Sch Pharm, Chapel Hill, NC 27599 USA
[5] China Med Univ & Hosp, Chinese Med Res & Dev Ctr, Taichung, Taiwan