methyl 2-(2-oxooxolan-3-yl)acetate

(1S,3R,4S,4aS,8S,8aS,2'S,3a'R,6a'S)-acetic acid 1-acetoxy-8-bromo-8-formyldecahydro-4-(hexahydrofuro[2,3-b]furan-2'-yl)-3,4-dimethylnaphthalen-8a-ylmethyl ester

(3R,4S,4aS,8R,8aS,2'S,3a'R,6a'S)-8a-(tert-butyldimethylsilanyloxymethyl)-4-(hexahydrofuro[2,3-b]furan-2'-yl)-3,4-dimethyloctahydro-8-vinylnaphthalen-1-one

(4aS,6R,7S,7aR,11S,2'S,3a'R,6a'S)-7-(hexahydrofuro[2,3-b]furan-2'-yl)-3,3,6,7-tetramethyloctahydronaphtho[1,8a-d][1,3]dioxine-11-carbaldehyde

(1S,3R,4S,4aS,8R,8aS,2'S,3a'R,6a'S)-acetic acid 1-acetoxydecahydro-4-(hexahydrofuro[2,3-b]furan-2'-yl)-3,4-dimethyl-8-vinylnaphthalen-8a-ylmethyl ester