[(1S,2S,3S,4S,6R)-1-Benzyloxy-4-(tert-butyl-dimethyl-silanyloxy)-3-(2,2-dimethoxy-ethyl)-3-methyl-7-oxa-bicyclo[4.2.0]oct-2-yl]-acetic acid methyl ester

(1aS,3aS,4S,5aR,7aS,7bR,8S,9S,11aR)-7a-acetoxy-9-hydroxy-3a,11a,12,12-tetramethyl-2-methylene-4-((triethylsilyl)oxy)tetradecahydro-1a,9-methanooxireno[2'',3'':5',6']cyclodeca[1',2':3,4]benzo[1,2-b]oxet-8-yl benzoate

(2aR,4S,4aS,8aS,8bS)-4-((tert-butyldimethylsilyl)oxy)-4a-methyloctahydrospiro[naphtho[2,1-b]oxete-7,2'-[1,3]dioxolan]-8b(1H)-ol

(3aS,9aS,10S,11aR,13aS,13bR,13cS)-13a-(benzyloxy)-10-hydroxy-6,9a,14,14-tetramethyl-8-methylene-4,5,8,9,9a,10,11,11a,13,13a,13b,13c-dodecahydro-3a,7-methanooxeto[2'',3'':5',6']benzo[1',2':3,4]cyclodeca[1,2-d][1,3]dioxol-2-one

[(1S,2S,3S,4S,6R)-1-Benzyloxy-4-(tert-butyl-dimethyl-silanyloxy)-3-methyl-3-(2-oxo-ethyl)-7-oxa-bicyclo[4.2.0]oct-2-yl]-acetic acid methyl ester