(E,2S)-2-amino-5-phenyl-pent-4-enoic acid

2-oxo-5-phenylpentanoic acid

(S)-2-azido-5-phenylpentanoic acid

(4S,5R)-1-((R)-2-bromo-5-phenylpentanoyl)-3,4-dimethyl-5-phenylimidazolidin-2-one

(4S,5R)-1-((S)-2-azido-5-phenylpentanoyl)-3,4-dimethyl-5-phenylimidazolidin-2-one