Acetic acid (E)-(R)-3-[(1S,4S,6R)-4-(tert-butyl-dimethyl-silanyloxy)-2,2,6-trimethyl-7-oxa-bicyclo[4.1.0]hept-1-yl]-1-methyl-allyl ester

(R)-4-[(R)-4-(tert-Butyl-dimethyl-silanyloxy)-2,6,6-trimethyl-cyclohex-1-enyl]-but-3-yn-2-ol