Sitagliptin Impurity G

Chemical Name: Benzenebutanoic acid, β-​[[(1,​1-​dimethylethoxy)​carbonyl]​amino]​-​3,​4-​difluoro-​, (βR)​-; (βR)-β-[[(1,1-Dimethylethoxy)carbonyl]amino]-3,4-difluorobenzenebutanoic acid ;(3R)-3-[(tert-Butoxycarbonyl)amino]-4-(3,4-difluorophenyl)butanoic acid ;(R)-3-(tert-Butoxycarbonylamino)-4-(3,4-difluorophenyl)butanoic acid