(Z)-4-[(2S,3S)-2-((1S,2R)-2,4-Bis-benzyloxy-1-methyl-butyl)-5-methoxy-tetrahydro-furan-3-yl]-3-methyl-but-3-en-2-one

(3R,4S)-4-[(2S,3R,5S)-3-((4E,6E)-(2R,3S,8R,9R)-3,9-Dihydroxy-2,6-dimethyl-8-trityloxymethyl-undeca-4,6-dienyl)-5-methoxy-tetrahydro-furan-2-yl]-3-hydroxy-pentanethioic acid S-pyridin-2-yl ester