Boc-D-Leu-L-Leu-L-threo-O-[L-Ser(OtBu)]-HyPhe-L-Leu(OTBS)-L-Leu-OAll

(4S,5R)-3-(tert-butoxycarbonyl)-5-isopropyl-2,2-dimethyl-1,3-oxazolidine-4-carboxylic acid

(1R,2R)-1-amino-1-(5-tert-butyl-1H-benzimidazol-2-yl)-3-methylbutan-2-ol