(1R,4S,6R)-6-benzyloxy-4-[(tert-butyldimethylsilyl)oxy]-1-(2,3-dimethoxyphenyl)-2-cyclohexene-1-acetic acid ethyl ester

(5aR,6S,7S,9R,9aR)-9-benzyloxy-6-bromo-7-[(tert-butyldimethylsilyl)oxy]-6,7,8,9-tetrahydro-4-methoxy-9a(5aH)-dibenzofuranacetic acid ethyl ester

(5aS,7S,9R,9aR)-7-[(tert-butyldimethylsilyl)oxy]-6,7,8,9-tetrahydro-9-hydroxy-4-methoxy-9a(5aH)-dibenzofurnacetic acid ethyl ester

(5aS,7R,9aS)-7-[(tert-butyldimethylsilyl)oxy]-6,7-dihydro-4-methoxy-9a(5aH)-dibenzofuranacetic acid ethyl ester

(5aS,7R,9aS)-7-[(tert-butyldimethylsilyl)oxy]-6,7-dihydro-4-methoxy-N-methyl-9a(5aH)-dibenzo-furanacetamide