(2S,5S)-1-tert-butoxycarbonyl-2-hydroxymethyl-3-phenylsulfonyl-5-benzyloxy-methyl pyrrolidine

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

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

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

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