Sitagliptin Impurity M

Chemical Name: Benzenebutanoic acid, β-​[[(1,​1-​dimethylethoxy)​carbonyl]​amino]​-​2-​fluoro-​, (βR)​-; (βR)-β-[[(1,1-Dimethylethoxy)carbonyl]amino]-2-fluorobenzenebutanoic acid ;(3R)-3-[(tert-Butoxycarbonyl)amino]-4-(2-fluorophenyl)butanoic acid ;(3R)-[(tert-Butoxycarbonyl)amino]-4-(2-fluorophenyl)butanoic acid; (R)-3-[(tert-Butoxycarbonyl)amino]-4-(2-fluorophenyl)butanoic acid