(E)-(R)-5-[(2R,3S,5R,6S)-5-Benzyloxy-6-(2-benzyloxy-ethyl)-3-(tert-butyl-dimethyl-silanyloxy)-2,6-dimethyl-tetrahydro-pyran-2-yl]-5-hydroxy-pent-2-enoic acid methyl ester

2-[(2R,4R,4aS,6S,7R,8aS)-7-Benzyloxy-6-(2-benzyloxy-ethyl)-4a,6-dimethyl-4-triisopropylsilanyloxy-octahydro-pyrano[3,2-b]pyran-2-yl]-ethanol