methyl (-)-(1α,4α,5α,7S*)-5-bromospiroheptane-2,2'-<1,3>dioxolane>-7-carboxylate

(-)-<1α,4α,7R*>-7-(iodomethyl)spirohept-5-ene-2,2'-<1,3>dioxolan>

methyl (-)-2-<(tert-butyldimethylsilyl)oxy>heptanoate