Methyl (2R,3S)-(+)-2-hydroxy-3-azido-3-phenyl-propionate

(2R,3S)-methyl 3-azido-3-phenyl-2-((triethylsilyl)oxy)propanoate

[(3R,4S)-2-oxo-4-phenylazetidin-3-yl] acetate

(3R,4S)-1-((S)-1-(4-methoxyphenyl)propyl)-2-oxo-4-phenylazetidin-3-yl acetate

(3R,4S)-3-triisopropylsilyloxy-4-phenylazetidin-2-one