(3SR,3aSR,7aRS)-3-(tert-butyldimethylsiloxy)-2,3,3a,4,7,7a-hexahydro-1H-inden-1-one

(E)-7-{(1R,2S,5R)-5-(tert-Butyl-dimethyl-silanyloxy)-2-[(E)-4-(tert-butyl-dimethyl-silanyloxy)-1-hydroxy-oct-2-enyl]-3-oxo-cyclopentyl}-hept-5-enoic acid tert-butyl ester

(E)-7-{(1R,5R)-5-[(E)-4-(tert-Butyl-dimethyl-silanyloxy)-1-hydroxy-oct-2-enyl]-4-oxo-cyclopent-2-enyl}-hept-5-enoic acid tert-butyl ester

(E)-7-{5-[(E)-4-(tert-Butyl-dimethyl-silanyloxy)-oct-2-en-(Z)-ylidene]-4-oxo-cyclopent-2-enyl}-hept-5-enoic acid tert-butyl ester