7Stevovic L S.An improved approach to B-norsteroids,an one-pot preparation of 3β-acetoxy-5,17-dioxo-5,6-seco-androstan-6-oic acids[J].J Serb Chem Soc,1998,63(2):955-959.
8Brodie A.Synthesis and activity of 17-azolysteroids as androgen synthesis inhibitors[P].US 5994335,1999-10-30.
9Rosenbaum P,Schmidt W,Helmerhorst F M,et al.Inhibition of ovulation by a novel progestogen (drospirenone) alone or in combination with ethinylestradiol[J].Eur J Contracept Reprod Health Care,2000,5(1):16-24.
10Mohr J T,Nickisch K.Preparation method for drospirenone[P].Ger DE 19633685,1997-10-09.