9-[4-benzyloxy-3-[[4-benzyloxy-5-(tert-butyl-diphenyl-silanyloxymethyl)-2-ethylsulfanyl-tetrahydro-furan-3-yloxy]-(4-methoxy-phenyl)-methoxy]-5-(2,2-dimethyl-propionyloxymethyl)-tetrahydro-furan-2-yloxy]-nonanoic acid methyl ester