(R)-((2S,3S)-2-Acetyl-3-benzoylamino-4-oxo-azetidin-1-yl)-phenyl-acetic acid methyl ester

3-(((allyloxy)carbonyl)methyl)-4,5-diphenyl-1-oxazolin-2-one

(2S,3S)-3-Hydroxy-4-methyl-2-(2-oxo-4,5-diphenyl-oxazol-3-yl)-pent-4-enoic acid

(2S,3S)-3-Hydroxy-4-methyl-2-(2-oxo-4,5-diphenyl-oxazol-3-yl)-pent-4-enoic acid allyl ester