p. 1044 - 1046
(2007/10/02)(3S,4R)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-cyclohexylsulfanyl-azetidin-2-one
(3R,4R)-4-benzyloxy-3-<(1R)-1-tert-butyldimethylsilyloxyethyl>azetidin-2-one
(3S,4R)-3-<(1R)-1-tert-butyldimethylsiloxyethyl>-4-(1-methoxycarbonyl-1-phenylthioethyl)azetidin-2-one