(2R,3R,4S,5R)-3,4,5-Tris-benzyloxy-2-[3-(tert-butyl-dimethyl-silanyloxy)-propyl]-6-hydroxy-piperidine-1-carboxylic acid tert-butyl ester

(3S,4R,5R)-5-(3-Benzyloxy-propyl)-1-(4-methoxy-benzyl)-3,4-bis-triisopropylsilanyloxy-pyrrolidin-2-one

(3S,4R,5R)-3,4-Bis-benzyloxy-5-(3-hydroxy-propyl)-pyrrolidin-2-one

(3S,4R,5R)-3,4-Dihydroxy-1-(4-methoxy-benzyl)-5-[3-(tetrahydro-pyran-2-yloxy)-propyl]-pyrrolidin-2-one

(3S,4R,5R)-3,4-Bis-benzyloxy-5-[3-(tert-butyl-dimethyl-silanyloxy)-propyl]-pyrrolidin-2-one