4,4-difluorobutanoic acid
(S)-2-(tert-Butoxycarbonylamino)-4,4-difluorobutanoic acid
(S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-4,4-difluorobutanoic acid
2,2-Difluorobutanoic acid
(S)-2-Amino-4,4-difluorobutanoic acid
