(3r,4r)-n-cbz-3,4-difluoropyrrolidine hydrochloride

(3R,4R)-Benzyl 3,4-difluoropyrrolidine-1-carboxylate hydrochloride

(3R,4R)-3,4-Difluoro-1-pyrrolidinecarboxylic acid phenylmethyl ester hydrochloride