Acetic acid (2S,3R)-6-[2-acetoxy-eth-(E)-ylidene]-2-methyl-2-pent-4-enyl-oxepan-3-yl ester

5-{(2S,3R)-3-(tert-Butyl-dimethyl-silanyloxy)-6-[2-(tert-butyl-dimethyl-silanyloxy)-eth-(E)-ylidene]-2-methyl-oxepan-2-yl}-pentan-2-one

Trifluoro-methanesulfonic acid 4-{(2S,3R)-3-(tert-butyl-dimethyl-silanyloxy)-6-[2-(tert-butyl-dimethyl-silanyloxy)-eth-(E)-ylidene]-2-methyl-oxepan-2-yl}-1-methylene-butyl ester