Alternate Names: (2S,3R)-3-Amino-2-hydroxy-4-phenylbutanoyl]-Leu; Ubenimex; NK-421; [S-(R*,S*)]-N-(3-Amino-2-hydroxy-1-oxo-4-phenylbutyl)-L-leucine; N-[(2S,3R)-3-Amino-2-hydroxy-4-phenylbutyryl]-L-leucine; [2S,3R]-3-Amino-2-hydroxy-4-phenylbutanoyl)-L-leucine