(2R,3S,4R,7S,9S)-3-(tert-Butyl-dimethyl-silanyloxy)-10-(tert-butyl-diphenyl-silanyloxy)-1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-7-hydroxy-4-(4-methoxy-benzyloxy)-2,9-dimethyl-decan-5-one