(5S)-5-[[tert-butyl(dimethyl)silyl]oxymethyl]-1-(4,5-dimethoxy-2-nitro-benzoyl)pyrrolidin-3-ol

(2S,4R)-N-(benzyloxycarbonyl)-2-t-butyldimethylsilyloxymethyl-4-hydroxypyrrolidine

(2S,4R)-N-(2-amino-4,5-dimethoxybenzoyl)-2-(tert-butyldimethylsilyloxymethyl)-4-hydroxypyrrolidine

{2-[(S)-2-(tert-Butyl-dimethyl-silanyloxymethyl)-4-eth-(E)-ylidene-pyrrolidine-1-carbonyl]-4,5-dimethoxy-phenyl}-carbamic acid allyl ester

(2S)-N-[(2-allyloxycarbonylamino)-4,5-dimethoxybenzoyl]-2-(tert-butyldimethylsilyloxymethyl)-4-oxopyrrolidine