1,5-Anhydro-4,6-O-benzylidene-3-O-(tert-butyldimethylsilyl)-2-C-((E)-carbethoxymethylene)-2-deoxy-D-arabino-2-hexitol

N-{9-[(4aR,7R,8R,8aR)-8-(tert-Butyl-dimethyl-silanyloxy)-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-7-yl]-6-oxo-6,9-dihydro-1H-purin-2-yl}-N-isobutyryl-isobutyramide

tert-Butyl-dimethyl-{(2R,4aR,8R,8aR)-2-phenyl-7-[2-vinyloxy-eth-(Z)-ylidene]-hexahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy}-silane