(4R,5S,6R)-7-Benzyloxy-5-(tert-butyl-dimethyl-silanyloxy)-4,6-dimethyl-heptanoic acid ethyl ester

(9R,10S,11R)-12-Benzyloxy-10-(tert-butyl-dimethyl-silanyloxy)-9,11-dimethyl-dodec-1-en-6-one