(R)-4-((2R,3S,4R)-1-Benzyl-3,4-bis-benzyloxy-pyrrolidin-2-yl)-4-hydroxy-butyric acid ethyl ester

(R)-4-((2S,3S,4R)-1-Benzyl-3,4-bis-benzyloxy-pyrrolidin-2-yl)-4-(tert-butyl-dimethyl-silanyloxy)-butyric acid ethyl ester

(1S,2R,8R,8aR)-1,2,8-tris(benzyloxy)hexahydroindolizin-5(1H)-one

(2R,3S,4R)-1-acetyl-3,4-dibenzyloxy-2-((1R)-1-benzyloxy-3-ethoxycarbonylpropyl)pyrrolidine

(2R,3S,4R)-N-benzyl-2-hydroxymethyl-3,4-(isopropylidenedioxy)pyrrolidine