phenylacetyl chloride
N-(phenylacetyl)-L-threonine O-benzylhydroxyamide
N-((2S,3S)-1-Benzyloxy-2-methyl-4-oxo-azetidin-3-yl)-2-phenyl-acetamide
(2S,3R)-3-hydroxy-2-(2-phenylacetamido)butanoic acid
(3S-trans)-1-Hydroxy-4-methyl-3-[(phenylacetyl)-amino]-2-azetidinone