Trifluoro-methanesulfonic acid (8R,9S,13S,14S)-3-(tert-butyl-dimethyl-silanyloxy)-14-hydroxy-13-methyl-7,8,9,11,12,13,14,15-octahydro-6H-cyclopenta[a]phenanthren-17-yl ester

3-(tert-butyldimethylsilyloxy)-1,3,5(10)-estratrien-17β-O,17α-(2'-butenolactone)

3-(tert-butyldimethylsilyloxy)-1,3,5(10)-estratrien-17β-O,17α-(2'-methylbutanolactone)

3-(tert-butyldimethylsilyloxy)-1,3,5(10)-estratrien-17β-O,17α-butanolactone

methyl 4-[3'-(tert-butyldimethylsilyloxy)-17'β-hydroxy-1',3',5'(10')-estratriene-16'β-yl]butanoate