... Steroids. Volume 54, Issue 1, July 1989, Pages 71-99. Cover image. ... 14. Wakel ing AE and Bowler J ( 1987). Biology and mode of action of pure antiestrogens. J STEROID BIOCHEM 30:141-147. STEROIDS 54/1 july 1989ng the intolerance of bulk around the amide moiety. ...