for the following products
(3R)-3-(1,1-Dimethylethoxycarbonyl)amino]-4-(2,4,5-trifluorophenyl) butanoic acid | (3R)-N-(tert-Butoxycarbonyl)-3-amino-4-(2,4,5-trifluorophenyl)butanoic acid | Boc-R-3-Amino-4-(2,4,5-trifluorophenyl)butanoic acid | [[(1,1-Dimethylethoxy)carbonyl]amino]-2,4,5-trifluoro-(R)-benzenebutanoic acid and (3R)-N-(tert-Butoxycarbonyl)-3-amino-4-(2,4,5-trifluorophenyl) butanoic acid
