103909-74-6
1-[1,3-bis-(tert-butyldimethylsilanyloxy)-10,13-dimethyl-2,3,4,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl]ethanol
→
103909-77-9
1α,3β-bis(tertbutyldimethylsilyloxy)-20α-(3-oxobutyloxy)-5,7-pregnadiene