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L-Tryptophan 1-(1,1-Dimethylethyl) (2S,4R)-4-fluoro-1,2-pyrrolidinedicarboxylate BOC-TRANS-4-FLUORO-L-PROLINE METHYL ESTER N-BOC-cis-4-fluoro-L-proline 2-(2,2-DIFLUORO-PROPYLAMINO)-ETHANOL Boc-L-Proline-methyl ester N-BOC-4,4-difluoro-L-proline 3,3-DIFLUOROPYRROLIDINE HYDROCHLORIDE N-trans-BOC-(3S)-Fluoropyrrolidine (2S,4S)-4-FLUORO-PYRROLIDINE-2-CARBOXYLIC ACID