2,2-Dimethyl-5-[(2,4,5-trifluorophenyl)acetyl]-1,3-dioxane-4,6-di one

ethyl 3-oxo-4-(2,4,5-trifluorophenyl)butanoate

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