(2S,4R)-4-(benzoyloxy)-1-(tert-butoxycarbonyl)pyrrolidine-2-carboxylic acid

(2S,4R)-tert-butyl 4-(benzoyloxy)-2-((benzyloxy)methyl)pyrrolidine-1-carboxylate

(2S,5S)-5-allyl-1-benzoyl-2-(tert-butyl)-3-methylimidazolidin-4-one

(2S,4R)-4-tert-butyl(dimethyl)silyloxy-2-formyl-1-methoxycarbonylpyrridine

(2S,4R)-4-tert-butyl(dimethyl)silyloxy-1-methoxycarbonyl-2-(2-methyl-1-propenyl)-pyrrolidine