4-benzyl-3-{2-[6-{1-benzyloxy-3-[6-[1-benzyloxy-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-butyl]-2-(4-methoxy-phenyl)-5-methyl-[1,3]dioxan-4-yl]-2-hydroxy-1-methyl-butyl}-2-(4-methoxy-phenyl)-5-methyl-[1,3]dioxan-4-yl]-propionyl}-oxazolidin-2-one