((1R,2R,4aS,8aS)-1,2,4a-Trimethyl-5-oxo-decahydro-naphthalen-1-yl)-acetic acid ethyl ester

ethyl 2-((4aS,5S,8aS)-5,8a-dimethyl-6-methyleneoctahydro-2H-spiro[naphthalene-1,2'-[1,3]dioxolan]-5-yl)acetate

((1R,2R,4aS,8aS)-1,2,4a-Trimethyl-5-trifluoromethanesulfonyloxy-1,2,3,4,4a,7,8,8a-octahydro-naphthalen-1-yl)-acetic acid ethyl ester

(4aS)-1,4aβ-dimethyl-4,4a,7,8-tetrahydronaphthalene-2,5(3H,6H)-dione-5-ethyeneacetal

(R)-5-[(1R,2R,4aS,8aS)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-1,2,4a-trimethyl-1,2,3,4,4a,7,8,8a-octahydro-naphthalen-1-yl]-4-hydroxy-3-methylene-pentan-2-one