benzyl 6-acetylpenicillanate

(3S,4R)-1-(tert-Butyl-dimethyl-silanyl)-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-chloro-azetidin-2-one

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

benzyl 2‐diazo‐3‐oxobutanoate

{(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-ylsulfanyl}-acetic acid methyl ester