D-(-)-leucine ethyl ester hydrochloride
N-((S)-2,4-bis-benzyloxycarbonylamino-butyryl)-L-leucine ethyl ester
(S)-2,4-bis(((benzyloxy)carbonyl)amino)butanoic acid
Dibenzyloxycarbonyl-L-α,γ-diamino-butyryl-D-leucin-ethylester
(S)-3-benzyloxycarbonylamino-2-oxo-pyrrolidine-1-carboxylic acid benzyl ester