ethyl (4S,4'S,5'S,Z)-4-[5'-(tertbutyldimethylsilyloxy)methyl-3'-methyl-2'-oxooxazolidin-4'-yl]-4-(tert-butyldimethylsilyloxy)but-2-enoate

(4R,5S)-4-[(E)-(S)-4-Benzyloxy-1-(tert-butyl-dimethyl-silanyloxy)-but-2-enyl]-5-benzyloxymethyl-oxazolidin-2-one

(R)-(tert-Butyl-dimethyl-silanyloxy)-[(4R,5S)-5-(tert-butyl-dimethyl-silanyloxymethyl)-3-methyl-2-oxo-oxazolidin-4-yl]-acetaldehyde

(4S,5S,1'S,E)-5-(tert-butyldimethylsilyloxy)methyl-4-[4'-chloro-1'-(tert-butyldimethylsilyloxy)but-2'-enyl]-3-methyloxazolidin-2-one

(4S,5S,1'S,E)-5-(tert-butyldimethylsilyloxy)methyl-4-[1',4-di(tert-butyldimethylsilyloxy)but-2'-enyl]-3-methyloxazolidin-2-one