Constantinou-Kokotou V, Magrioti V, Markidis T, Kokotos G. Synthesis of enantiopure non-natural ?-amino acids using tert-butyl (2S)-2-[bis- (tert-butoxycarbonyl)amino]5-oxopentanoate as key-intermediate: The first synthesis of (S)-2-amino-oleic acid. Journal of Peptide Research. 2001;58:325-331.