(4S,5S)-3-(tert-butoxycarbonyl)-5-cyanomethyl-4-cyclohexylmethyl-2,2-dimethyl-1,3-oxazolidine

(4S,5S)-4-Cyclohexylmethyl-5-methoxycarbonylmethyl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

(4S,5S)-5-Carboxymethyl-4-cyclohexylmethyl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester