(Z)-7-[(1R,2S,3R)-2-(tert-Butyl-diphenyl-silanyloxymethyl)-5-methylene-3-(tetrahydro-pyran-2-yloxy)-cyclopentyl]-hept-5-enoic acid methyl ester

(2bS,4R,5S,5aS)-5-(tert-Butyl-dimethyl-silanyloxymethyl)-4-(tetrahydro-pyran-2-yloxy)-octahydro-2-oxa-cyclobuta[a]pentalen-1-ol

(Z)-5-[(3aS,5R,6S,6aS)-6-(tert-Butyl-dimethyl-silanyloxymethyl)-5-(tetrahydro-pyran-2-yloxy)-1,3a,4,5,6,6a-hexahydro-pentalen-2-yl]-pent-4-enoic acid

methyl (1R,5S,6S,7R)-6-tert-butyldimethylsilyloxymethyl-7-tetrahydropyranyloxybicyclo<3.3.0>oct-2-ene-3-γ-pentenoate