[1] China Pharmaceut Univ, Dept Nat Prod Chem, Nanjing 210009, Peoples R China
[2] Chinese Acad Sci, Shanghai Inst Organ Chem, State Key Lab Bioorgan & Nat Prod Chem, Shanghai 200032, Peoples R China
[3] Chinese Univ Hong Kong, Sch Chinese Med, Hong Kong, Hong Kong, Peoples R China