Acetic acid (1R,2S,4R)-2-benzyloxy-1-benzyloxymethyl-4-[1,3]dithiolan-2-yl-4-methoxycarbonylamino-butyl ester
Acetic acid (1R,2S,4R)-2-benzyloxy-1-benzyloxymethyl-4-methoxycarbonylamino-5-oxo-pentyl ester
(4R)-4-<3-(Benzyloxycarbonyl)-2-oxopropyl>azetidin-2-one
(R)-4-((2S,3R)-2,4-Bis-benzyloxy-3-hydroxy-butyl)-azetidin-2-one
(R)-4-((S)-2,4-Bis-benzyloxy-butyl)-1-(tert-butyl-dimethyl-silanyl)-azetidin-2-one
Dithiocarbonic acid O-{(1R,2S)-2-benzyloxy-1-benzyloxymethyl-3-[(R)-1-(tert-butyl-dimethyl-silanyl)-4-oxo-azetidin-2-yl]-propyl} ester S-methyl ester
(3S,4R)-4-((S)-2,4-Bis-benzyloxy-butyl)-1-(tert-butyl-dimethyl-silanyl)-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-azetidin-2-one