Toluene-4-sulfonic acid 4-(tert-butyl-dimethyl-silanyloxy)-4-ethyl-hexyl ester

(20R)-De-A,B-8-bromomethylene-24,26,27-trihomo-22-oxacholestan-25-ol

(20R)-De-A,B-8β,25-bis[(tert-butyldimethylsilyl)oxy]-24,26,27-trihomo-22-oxacholestane