(S)-1-{5-[(1R,3S)-3-((4S,5S)-2,2-Di-tert-butyl-5-ethyl-[1,3,2]dioxasilinan-4-yl)-1-methyl-butyl]-furan-2-yl}-4-((2R,5R,6S)-5-ethyl-6-methyl-5-triethylsilanyloxy-tetrahydro-pyran-2-yl)-4-hydroxy-pentan-1-one