(4R,5R)-5-((S)-3-Benzyloxycarbonylamino-1-methyl-propyl)-4-(tert-butyl-diphenyl-silanyloxymethyl)-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

(3R,4R)-N-benzyloxycarbonyl-3,4-<3'-N-tert-butoxycarbonyl-2',2'-dimethyl-1',3'-oxazolidinyl> azepane

(4R,5R)-3-N-tert-butoxycarbonyl-4-tert-butyldiphenylsilyloxymethyl-5-<3''-hydroxypropyl>-2,2-dimethyl-1,3-oxazolidine

(4R,5R)-3-N-tert-butoxycarbonyl-4-hydroxymethyl-5-(3''-hydroxypropyl)-2,2-dimethyl-1,3-oxazolidine

(4R,5S)-3-N-tert-butoxycarbonyl-4-heptyl-5-hydroxymethyl-2,2-dimethyl-1,3-oxazolidine