英文别名(R)-Sitagliptin Methyl-Ester Impurity; (3R)-3-amino-4-(2,4,5-trifluorophenyl)butanoate; (R)-Methyl 3-amino-4-(2,4,5-trifluorophenyl)butanoate; Methyl (R)-β-Amino-2,4,5-F3-benzenebutanoate; Benzenebutanoic acid, β-amino-2,4,5-trifluoro-, methyl ester, (βR)- 
