p. 1007 - 1011
(1990)1-(tert-butoxycarbonyl)-L-proline
(S)-2-[1-((S)-1-Benzyloxycarbamoyl-ethylcarbamoyl)-3-methyl-butylcarbamoyl]-pyrrolidine-1-carboxylic acid tert-butyl ester
(S)-2-[1-((S)-1-Hydroxycarbamoyl-ethylcarbamoyl)-3-methyl-butylcarbamoyl]-pyrrolidine-1-carboxylic acid tert-butyl ester
(S)-2-[(S)-1-((S)-1-Benzyloxycarbamoyl-ethylcarbamoyl)-3-methyl-butylcarbamoyl]-pyrrolidine-1-carboxylic acid tert-butyl ester
Boc-Leu-Ala-NHOBzl