[(2R,3S)-3-((R)-1-Hydroxy-ethyl)-2-((1R,3S)-3-hydroxy-2-oxo-cyclohexyl)-4-oxo-azetidin-1-yl]-(triphenyl-λ5-phosphanylidene)-acetic acid benzhydryl ester

(3S,4R)-3-<(1R)-1-tert-butyldimethylsilyloxyethyl>-4-<(1R,3S)-3-triethylsilyloxy-2-oxocyclohexyl>-2-azetidinone

(3S,4R)-3-<(1R)-1-tert-butyldimethylsilyloxyethyl>-4-<(1S,3S)-3-hydroxy-2-oxocyclohexyl>-2-azetidinone

6-羟基-1-环己烯羧酸乙酯

(3S,4R)-3-<(1R)-1-tert-butyldimethylsilyloxyethyl>-4-<(1S)-2-hydroxymethylcyclohex-2-enyl>-2-azetidinone