References
- Chen , H. , Xu , N. and Zhou , Y.Z. 2008 . Steroids , 73 : 629
- Zhang , Z.X. , Zhou , J. , Hayashi , K. and Mitsuhashi , H. 1985 . Chem. Pharm. Bull. , 33 : 4188
- Li , X.Y. , Sun , H.X. , Ye , Y.P. , Chen , F.Y. and Pan , Y.J. 2006 . Steroids , 71 : 61
- Qiu , S.X. , Zhang , Z.X. and Zhou , J. 1991 . Planta Med. , 57 : 454