英文别名methyl (3R)-3-acetamido-4-(2,4,5-trifluorophenyl)butanoate; (R)-methyl-3-N-acetylamino-4-(2,4,5-trifluorophenyl)butanoate; Benzenebutanoic acid, β-(acetylamino)-2,4,5-trifluoro-, methyl ester, (βR)-; Sitagliptin impurity O; Sitagliptin Impurity 117; Methyl 3-acetamido-4-(2,4,5-trifluorophenyl)butanoate, (R)-; Methyl (βR)-β-(acetylamino)-2,4,5-trifluorobenzenebutanoate 
