Synonyms: Benzenebutanoicacid,b-[[(1,1-diMethylethoxy)carbonyl]aMino]-2,4,5-trifluoro-,Methylester,(bR)-;(R)-Sitagliptin N-Boc-Methyl-Ester IMpurity;(3R)-tert-ButoxycarbonylaMino-4-(2,4,5-trifluoro-phenyl)-butyric acid Methyl ester;Methyl (R)-b-(Boc-amino)-2,4,5-F3-benzenebutanoate