(R)-4-{2-[(1Ξ,3R)-4-(tert-butyl-diphenyl-silanyloxy)-1,3-dimethyl-butyl]-5,5-dimethyl-[1,3]dioxan-2-yl}-2-methyl-butyraldehyde
methyl 5-(2,2,2-trifluoro-N-methylacetamido)-2-lithiomethyl-4-benzoxazolecarboxylate
2-((2R,3R)-5-{2-[(1Ξ,3R)-4-(tert-butyl-diphenyl-silanyloxy)-1,3-dimethyl-butyl]-5,5-dimethyl-[1,3]dioxan-2-yl}-2-hydroxy-3-methyl-pentyl)-5-(methyl-trifluoroacetyl-amino)-benzooxazole-4-carboxylic acid methyl ester