(3aR,4S,5R,7R,7aR)-methyl 5-acetoxy-7-((tert-butyldimethylsilyl)oxy)-4-hydroxy-2,2-dimethylhexahydrobenzo[d][1,3]dioxole-5-carboxylate

(3aR,5R,5aR,8aS,8bS)-5-(tert-Butyl-dimethyl-silanyloxy)-2-dimethylamino-7,7-dimethyl-tetrahydro-benzo[1,2-d;3,4-d']bis[1,3]dioxole-3a-carboxylic acid methyl ester

(3aS,5R,7R,7aR)-5-Acetoxy-7-(tert-butyl-dimethyl-silanyloxy)-2,2-dimethyl-4-oxo-hexahydro-benzo[1,3]dioxole-5-carboxylic acid methyl ester

methyl (1R,4S,4aR,6R,8R,8aS)-6-acetoxy-8-((tert-butyldimethylsilyl)oxy)-5-oxo-1,4,4a,5,6,7,8,8a-octahydro-1,4-methanonaphthalene-6-carboxylate

(1R,3S,4R,5R)-methyl 1-acetoxy-5-((tert-butyldimethylsilyl)oxy)-3,4-dihydroxy-2-oxocyclohexanecarboxylate