(S)-3-((benzyloxycarbonyl)amino)-4-(2,4,5-trifluorophenyl)-4-oxobutanoic acid methyl ester

(S)-4-oxo-4-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]-1-(2,4,5-trifluorophenyl)butan-2-yl p-toluenesulfonate

ethyl (R)-3-tert-butoxycarbonylamino-4-(2,4,5-trifluoro-phenyl)-butyrate

tert-butyl (R)-(4-(methylthio)-1-(2,4,5-trifluorophenyl)butan-2-yl)carbamate