4-[(2R,3S)-3-((R)-1-Hydroxy-ethyl)-4-oxo-azetidin-2-yl]-3-oxo-butyric acid benzyl ester

4-{(2R,3S)-1-(tert-Butyl-dimethyl-silanyl)-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-2-diazo-3-oxo-butyric acid benzyl ester

3-Butenoic acid, 2-diazo-3-[(trimethylsilyl)oxy]-, phenylmethyl ester

benzyl 2‐diazo‐3‐oxobutanoate

2-Diazo-4-[(2R,3S)-3-((R)-1-hydroxy-ethyl)-4-oxo-azetidin-2-yl]-3-oxo-butyric acid benzyl ester