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Sitagliptin defuoro impurity 3851307-12-5100 % similar Boc-(S)-3-amino-4-(4-fluoro-phenyl)-butyric acid218608-97-072 % similar Boc-(R)-3-amino-4-(4-fluoro-phenyl)-butyric acid218609-00-872 % similar Boc-(R)-3-amino-4-(3,4-difluoro-phenyl)-butyric acid269396-59-068 % similar Boc-(R)-3-amino-4-(2-chloro-phenyl)-butyric acid218608-93-664 % similar Boc-(S)-3-Amino-4-(2-chlorophenyl)butyric acid218608-95-864 % similar (R)-3-((tert-Butoxycarbonyl)amino)-4-(2,4-dichlorophenyl)butanoic acid269396-53-463 % similar Boc-(S)-3-amino-4-(2,4-dichloro-phenyl)-butyric acid270063-48-463 % similar (S)-3-(Boc-amino)-4-phenylbutyric acid51871-62-662 % similar Boc-(S)-3-amino-4-(2-trifluoromethyl-phenyl)-butyric acid270065-74-262 % similar Boc-(S)-3-amino-4-(1-naphthyl)-butyric acid219297-09-361 % similar 3-[(tert-Butoxycarbonyl)amino]-3-(4-fluorophenyl)propanoic acid284493-72-760 % similar Boc-(S)-3-amino-4-(4-pyridyl)-butyric acid219297-13-959 % similar Boc-(R)-3-amino-4-(4-methyl-phenyl)-butyric acid269398-85-859 % similar Boc-(R)-3-amino-4-(3-methyl-phenyl)-butyric acid269398-83-658 % similar Boc-(S)-3-amino-4-(3-chloro-phenyl)-butyric acid270596-39-958 % similar Boc-(R)-3-amino-4-(3-trifluoromethyl-phenyl)-butyric acid269726-74-158 % similar Boc-(S)-3-amino-4-(3-trifluoromethyl-phenyl)-butyric acid270065-77-558 % similar Boc-(R)-3-amino-4-(4-iodo-phenyl)-butyric acid269396-71-658 % similar Boc-(R)-3-amino-4-(3-thienyl)-butyric acid269726-92-358 % similar