(-)-N-(2S,3R)-3-(Amino-2-hydroxy-4-(4'-hydroxyphenyl)butyryl)-L-leucine 70267-76-4 82273-13-0 L-Leucine, N-(3-amino-2-hydroxy-4-(4-hydroxyphenyl)-1-oxobutyl)-, (S-(R*,S*))- N-(3-Amino-2-hydroxy-4-(4-hydroxyphenyl)-1-oxobutyl)-L-leucine (S-(R*,S*))- OH-Ubenimex p-Hydroxybestatin p-Hydroxyubenimex