(2R,5S)-5-(benzyloxymethyl)-1-(tert-butoxycarbonyl)pyrrolidine-2-carboxylic acid

methyl trans-4-[(5R)-methoxymethyl-(2S)-pyrrolidinylmethoxy]cyclohexanecarboxylate

(2S,5R)-1-tert-butoxycarbonyl-2-hydroxymethyl-5-(1'-hydroxy-1'-methylethyl)-pyrrolidine

(2S,5R)-1-tert-butoxycarbonyl-2-benzyloxymethyl-5-methoxycarbonyl-pyrrolidine

(2S,5R)-1-tert-butoxycarbonyl-2-benzyloxymethyl-5-(1'-hydroxy-1'-methylethyl)-pyrrolidine