(1R,3R,5S,8R,9S,11R)-9-(bromomethyl)-3-<(tert-butyldimethylsilyl)oxy>-11-<<(tert-butyldimethylsilyl)oxy>methyl>-5,9-dimethyl-4-methylidine-10-oxotricyclo<6.2.1.01.5>undec-6-ene

methyl (3aS,3bR,4S,5R,6R,7S,7aR,8aR)-5,7a-dihydroxy-2,2,3b-trimethyl-9-oxo-6-(prop-1-en-2-yl)octahydro-3aH-4,7-(epoxymethano)indeno[1,2-d][1,3]dioxole-3a-carboxylate

(1R,5R,7S,8R)-7-Bromomethyl-5-[(R)-2-(tert-butyl-dimethyl-silanyloxy)-but-3-ynyl]-8-(tert-butyl-dimethyl-silanyloxymethyl)-4,7-dimethyl-6-oxa-bicyclo[3.2.1]oct-3-ene

methyl (3aS,3a1R,5aS,6R,7R,8S,8aR,9aR)-6,8a-dihydroxy-2,2,3a1-trimethyl-4-oxo-7-(prop-1-en-2-yl)octahydro-4H-furo[2',3',4':7,1]indeno[1,2-d][1,3]dioxole-8-carboxylate

(2aS,3R,4aR,5S,6R,7R,7aS,7bR)-7-Acetoxy-2a,3,4a-trihydroxy-6-isopropenyl-7b-methyl-2-oxo-decahydro-indeno[7,1-bc]furan-5-carboxylic acid methyl ester