(2aR,5R,7aR)-5-(2-Hydroxy-ethyl)-2a-hydroxymethyl-6,6-dimethyl-2-methylene-hexahydro-cyclobuta[c]pentalen-3-one

(2aR,5R,7aR)-2a-(tert-Butyl-dimethyl-silanyloxymethyl)-5-(2-methoxymethoxy-ethyl)-6,6-dimethyl-2-methylene-hexahydro-cyclobuta[c]pentalen-3-one

tert-Butyl-{(Z)-2-[3-(2-methoxymethoxy-ethyl)-2,4,4-trimethyl-cyclopent-1-enyl]-vinyloxy}-dimethyl-silane

(6S,6aS)-6-(2-Methoxymethoxy-ethyl)-3,5,5-trimethyl-4,5,6,6a-tetrahydro-1H-pentalen-2-one

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