杂氮双环磷酸酯

(R)-2-[(2S,3S)-4-Oxo-3-((R)-1-triethylsilanyloxy-ethyl)-azetidin-2-yl]-thiopropionic acid S-((R)-5-oxo-1-triethylsilanyl-pyrrolidin-3-yl) ester

(4S,5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-[1,3]dithian-2-ylidene-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid benzhydryl ester

(3S,4S)-3-<(tert-butyldimethylsiloxy)methyl>-4-<1(R)-(methoxycarbonyl)ethyl>azetidin-2-one

[(3S,4S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-oxo-4-((R)-1-phenylsulfanylcarbonyl-ethyl)-azetidin-1-yl]-acetic acid allyl ester