tert-butyl (1S,3R,5R)-3-(tert-butyl)-6-oxo-7,7-(ethylenedithio)-2-oxa-4-azabicyclo[3.2.0]heptane-4-carboxylate

(2R,4S)-methyl 2-tert-butyl-3-formyl-4-methyloxazolidine-4-carboxylate

(2R,4S)-2-(tert-Butyl)-4-ethyl-2-formyloxazolidin-4-carbonsaeure-methylester

(2R,4S)-2-tert-Butyl-3-methoxycarbonyl-1,3-oxazoline-4-carboxylic acid

(2R,4R)-4-Acetoxy-2-tert-butyl-oxazolidine-3-carboxylic acid methyl ester