英文别名Sitagliptin Defuoro Impurity 3; Sitagliptin Defluoro Impurity 3; (3R)-3-[(tert-Butoxycarbonyl)amino]-4-(2,4-difluorophenyl)butanoic acid; (R)-3-(tert-butoxycarbonylamino)-4-(2,4-difluorophenyl)butanoic acid; Sitagliptin Impurity L; (R)-β-(Boc-amino)-2,4-difluorobenzenebutanoic acid; 3-TERT-BUTOXYCARBONYLAMINO-4-(2,4-DIFLUORO-PHENYL)-BUTYRIC ACID; Sitagliptin Impurity 23 
