[3S-[3α(S*),4β]]-4-benzoyl-3-[1-[[[(1,1-dimethyl-ethyl)dimethyl]silyl]oxy]ethyl]-2-azetidinone

[3S-[3α(S*),4β]]-3-(1-t-butyldimethylsilyloxyethyl)-4-acetyl-2-azetidinone

(2R,3R)-3-((R)-1-(tert-butyldimethylsilyloxy)ethyl)-1-(4-methoxyphenyl)-4-oxoazetidin-2-yl acetate

(1'R,3S)-3-<1'-<(tert-butyldimethylsilyl)oxy>ethyl>azetidin-2-one

乙醛