{(R)-2-[(R)-2-(tert-Butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-6-ethoxy-tetrahydro-pyran-4-yl}-acetonitrile

(Z)-(5R,6R)-7-(tert-Butyl-dimethyl-silanyloxy)-5-(1-ethoxy-2-iodo-ethoxy)-6-methyl-hept-2-enoic acid methyl ester