(R)-5-((S)-3-Amino-3-carboxy-propyl)-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

(R)-2-[2',2'-dimethyl-N(3')-tert-butoxycarbonyl-1',3'-oxazolidin-5'-yl]ethanol

(5R)-3-(tert-butyloxycarbonyl)-2,2-dimethyl-5-(1-tosyloxy-ethyl)oxazolidine