methyl 5(S)-(tert-butyldiphenylsilyl)oxy-6-oxo-hexanoate

(3aS,4R,5S,6aR)-methyl [5-(tert-butyldimethylsilyl)oxy-2-oxohexahydro-cyclopenta[b]furan-4-yl]acetate

(3S,3aR,5R,6S,7aS)-3-(tert-Butyl-dimethyl-silanyloxy)-5,6-dihydroxy-octahydro-inden-1-one

7-[(3aS,4R,5S,6aR)-5-(tert-butyl-dimethylsilyl)oxy-2-oxo-hexahydrocyclopenta[b]furan-4-yl]-5-hydroxy-hept-6-enoic acid methyl ester

[3-(tert-butyl-dimethylsilyl)oxy-2-carboxymethyl-5-oxo-cyclopentyl]acetic acid