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N-Boc-Trans-4-Hydroxy-D-proline methyl ester (2R,4S)-1-tert-Butyl 2-methyl 4-aminopyrrolidine-1,2-dicarboxylate (2R,4R)-1-tert-Butyl 2-methyl 4-hydroxypyrrolidine-1,2-dicarboxylate Boc-L-Proline-methyl ester 1-Boc-Pyrrolidine N-Boc-D-proline D-Proline BOC-D-HYP-OTBU