(4R,5S,7R,8R,9R,10S,14R,16S)-20-(Methanesulfonyl)-13-<(tert-butyldimethylsilyl)oxy>-16-ethoxy-21-norpicras-2,12-diene

(1S,2S,4aS,4bR,10aS)-1,2,3,4,4a,4b,5,6,10,10a-decahydro-2-(methanesulfonyl)-7-methoxy-1,4a-dimethylphenanthrene

(1R,4aS,4bR,8aS,9R,10aS)-8a-Benzyloxymethyl-7,9-bis-(tert-butyl-dimethyl-silanyloxy)-1,4a-dimethyl-1,4,4a,4b,5,8,8a,9,10,10a-decahydro-phenanthrene

(S)-(-)-2,3,4,4a,9,10-hexahydro-7-methoxy-1,4a-dimethyl-2-oxophenanthrene

(1S,2S,4aS,4bR,9R,10aS)-9-<(tert-Butyldimethylsilyl)oxy>-1,2,3,4,4a,4b,5,6,7,9,10,10a-dodecahydro-2-(methanesulfonyl)-1,4a-dimethylphenanthren-7-one