(5R,5aR,7S,8aS)-7-(tert-Butyl-dimethyl-silanyloxy)-5-methoxymethoxy-1,4,5,5a,6,7,8,8a-octahydro-2H-as-indacen-3-one

((S)-3-Bromo-cyclopent-3-enyloxy)-tert-butyl-dimethyl-silane

(1S,2R,4S)-2-[(S)-4-(tert-Butyl-dimethyl-silanyloxy)-cyclopent-1-enyl]-7,7-dimethoxy-bicyclo[2.2.1]hept-5-en-2-ol

(1R,2S,4R)-2-[(S)-4-(tert-Butyl-dimethyl-silanyloxy)-cyclopent-1-enyl]-7,7-dimethoxy-bicyclo[2.2.1]hept-5-en-2-ol

(2S,3aR,5aS,8aR,8bS)-2-(tert-Butyl-dimethyl-silanyloxy)-6,6-dimethoxy-2,3,3a,5,5a,6,8a,8b-octahydro-1H-as-indacen-4-one