3′-(S)-4-(S)-3-(R)-[3′-t-butyldimethylsilyloxy-3′-(4-fluorophenyl)propyl]-4-(4-hydroxyphenyl)-1-(4-fluorophenyl)azetidin-2-one

(3S,4R)-1-(4-Fluoro-phenyl)-4-(4-hydroxy-phenyl)-3-phenethylsulfanyl-azetidin-2-one

trans-1-(4-fluorophenyl)-4-(4-hydroxyphenyl)-3-[(2-phenylethyl)-thio]-2-azetidinone

(3S,4R)-4-(4-((tert-butyldimethylsilyl)oxy)phenyl)-1-(4-fluorophenyl)-3-(2-(2-(4-fluorophenyl)-5,5-dimethyl-1,3-dioxan-2-yl)ethyl)azetidin-2-one

(3S,4R)-4-[4-(tert-Butyl-dimethyl-silanyloxy)-phenyl]-1-(4-fluoro-phenyl)-3-phenethylsulfanyl-azetidin-2-one