(1S,4S,4aS,8aS)-4-(tert-butyldimethylsilyloxy)-2-(tert-butyldimethylsilyloxymethyl)-1,4,4a,5,6,7,8,8a-octahydro-1-hydroxy-5,5,8a-trimethylnaphthalene-1-carboxaldehyde

(1S,4R,4aS,8aS)-4-(tert-Butyl-dimethyl-silanyloxy)-1,2-bis-hydroxymethyl-5,5,8a-trimethyl-1,4,4a,5,6,7,8,8a-octahydro-naphthalen-1-ol

(1R,5R,5aS,9aS,9bS)-5-(tert-Butyl-dimethyl-silanyloxy)-6,6,9a-trimethyl-3,5,5a,6,7,8,9,9a-octahydro-naphtho[1,2-c]furan-1,9b-diol

(5R,5aS,9aS)-5-(tert-butyldimethylsilyloxy)-4,5,5a,6,7,8,9,9a-octahydro-6,6,9a-trimethylnaphtho<1,2-c>furan-3(1H)-one

(5S,5aS,9aS,9bS)-5-(tert-butyldimethylsilyloxy)-5,5a,6,7,8,9,9a,9b-octahydro-9b-hydroxy-6,6,9a-trimethylnaphtho<1,2-c>furan-3(1H)-one