5-n-butylimidazolidine-2,4-dione

(2S)-2-aminohex-4-enoic acid

Hexanoic acid, 2-bromo-, (2S)-

methyl (2R)-2-amino-2-butylacetate

1-methyl-(3R)-n-butyl-4-<(S)-α-phenylethyl>-1,4-benzodiazepine-2,5-dione