methyl (+)-(1β,4β,5β,7R*)-5-bromospiroheptane-2,2'-<1,3>dioxolane>-7-carboxylate

(3aR,4R,6aS)-4-Methyl-3,3a,4,6a-tetrahydro-cyclopenta[b]furan-2-one

(5S,6S)-6-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-5-methyl-tetrahydro-pyran-2-one

(3S,5S,6S)-6-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3,5-dimethyl-tetrahydro-pyran-2-one