(5aS,9aR,9bS)-4-Hydroxy-9a-methyl-5,5a,6,7,8,9,9a,9b-octahydro-1H-naphtho[1,2-c]furan-3-one

(1R,2R,4aS,8aR)-1-(tert-Butyl-dimethyl-silanyloxymethyl)-8a-methyl-3-oxo-decahydro-naphthalene-2-carboxylic acid methyl ester

(1R,4S,4aS,8aR)-4-(tert-Butyl-dimethyl-silanyloxymethyl)-4a-methyl-2-oxo-decahydro-naphthalene-1-carboxylic acid methyl ester

(1S,2S,4aS,8aR)-2-[(R)-1-(2-Benzyloxy-ethyl)-2-methyl-allyl]-1-(tert-butyl-dimethyl-silanyloxymethyl)-8a-methyl-3-oxo-decahydro-naphthalene-2-carboxylic acid methyl ester

(1S,4aS,8aR)-3-((E)-5-Benzyloxy-2-methyl-pent-2-enyloxy)-1-(tert-butyl-dimethyl-silanyloxymethyl)-8a-methyl-1,4,4a,5,6,7,8,8a-octahydro-naphthalene-2-carboxylic acid methyl ester