(3S,4S)-1-(tert-Butyl-dimethyl-silanyl)-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-iodomethyl-azetidin-2-one

<3S-<3α(S*),4β>>-3-(1-t-butyldimethylsilyloxyethyl)-4-iodomethyl-2-azetidinone

(-)-1-(tert-butyldimethylsilyl)-3α-<(1R)-1-<(tert-butyldimethylsilyl)oxy>ethyl>-4β-<3-(ethoxycarbonyl)-2,2-(ethylenedioxy)propyl>azetidin-2-one