5βH-2-<<(tert-butyldimethylsilyl)oxy>methyl>-6β-<2-(methoxymethoxy)ethyl>-7,7-dimethylbicyclo<3.3.0>oct-1-en-3-one

ethyl 5,5-dimethyl-6-vinyl-8-<(methoxymethyl)oxy>oct-2-ynoate

6-(2-Methoxymethoxy-ethyl)-5,5-dimethyl-oct-7-en-2-yn-1-ol