(4R,6R)-4-[(S)-5-[(2R,4S,5S,6S)-6-Allyl-4-(tert-butyl-dimethyl-silanyloxy)-2-methoxy-5-vinyl-tetrahydro-pyran-2-yl]-4-(tert-butyl-dimethyl-silanyloxy)-pentyl]-6-((R)-1-benzyloxymethyl-propyl)-2,2-dimethyl-[1,3]dioxane-4-carbonitrile

[2-[5-[6-(1-benzyloxymethyl-propyl)-4-cyano-2,2-dimethyl-[1,3]dioxan-4-yl]-2-(tert-butyl-dimethyl-silanyloxy)-pentyl]-4-(tert-butyl-dimethyl-silanyloxy)-2-methoxy-5-oxo-hexahydro-pyrano[4,3-b]pyran-7-ylmethyl]-phosphonic acid diethyl ester