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RETAG-003 Sitagliptin-10 Sitagliptin Impurity 55 Sitagliptin EP Impurity 17 3-oxo-4-(2,4,5-trifluorophenyl Methyl 3-oxo-4-(2,4,5-trifluorophenyl) Methyl 2,4,5-trifluoro-b-oxo-benzenebutanoate Methyl 3-oxo-4-(2,4,5-trifluorophenyl)butanoate Benzenebutanoicacid,2,4,5-trifluoro-b-oxo-,Methylester 2,4,5-Trifluoro-β-oxo-benzenebutanoic Acid Methyl Ester 4-(2,4,5 )triflorophenyl 3-oxobutanoic acid, Methy ester 3-oxo-4-(2,4,5-trifluorophenyl)butanoic acid methyl ester Benzenebutanoic acid, 2,4,5-trifluoro-β-oxo-, methyl ester 4-(2,4,5-trifluoro-phenyl)-3-oxo-butyric acid methyl ester 3-OXO-4-(2,4,5-TRIFLUORO-PHENYL)-BUTYRIC ACID METHYL ESTER 2,4,5-TRIFLUORO-BETA-OXO-BENZENEBUTANOIC ACID METHYL ESTER