p. 6163 - 6166
(1999)[1-benzyl-3-cyano-2-oxo-3-(triphenyl-λ5-phosphanylidene)-propyl]-carbamic acid tert-butyl ester
2-(3-tert-butoxycarbonylamino-2-oxo-4-phenylbutyrylamino)-4-methylpentanoic acid benzyl ester
Boc-D-Phe-OH
(S)-benzyl 2-((2S,3R)-3-((tert-butoxycarbonyl)amino)-2-hydroxy-4-phenylbutanamido)-4-methylpentanoate