(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

methyl (4S,4'S,4a'S,8a'S)-4'a,5',6',7',8',8'a-hexahydro-4'-hydroxy-5',5',8'a-trimethyl-2-oxospiro<1,3-dioxolane-4,1'(4'H)-naphthalene>-2'-carboxylate

methyl (4S,4'R,4a'S,8a'S)-4'a,5',6',7',8',8'a-hexahydro-4'-hydroxy-5',5',8'a-trimethyl-2-oxospiro<1,3-dioxolane-4,1'(4'H)-naphthalene>-2'-carboxylate

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

methyl (4S,4'S,4a'S,8a'S)-4'-(tert-butyldimethylsilyloxy)-4'a,5',6',7',8',8'a-hexahydro-5',5',8'a-trimethyl-2-oxospiro<1,3-dioxolane-4,1'(4'H)-naphthalene>-2'-carboxylate