BOC-L-aspartic acid 4-benzyl ester
Boc-Glu(OBzl)-OH
BOC-O-benzyl-L-serine
(S)-4-tert-Butoxycarbonylamino-5-ethoxycarbonyloxy-5-oxo-pentanoic acid benzyl ester
N-t-Butoxycarbonyl-γ-benzyl-L-glutamyl-γ-benzyl-L-glutamyl-O-benzyl-L-seryl-L-leucyl-L-alanine benzyl ester