(3S,4R,5R)-3,4-Dihydroxy-1-(4-methoxy-benzyl)-5-methyl-pyrrolidin-2-one

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

(2R,3R,4S)-3,4-Bis-benzyloxy-2-methyl-5-oxo-pyrrolidine-1-carboxylic acid tert-butyl ester

(3S,4R,5R)-1-(4-Methoxy-benzyl)-5-methyl-3,4-bis-triisopropylsilanyloxy-pyrrolidin-2-one

(2R,3R,4R,5R)-3,4-Bis-benzyloxy-2-(4-methoxy-phenyl)-5-methyl-pyrrolidine-1-carboxylic acid tert-butyl ester