ethyl (5S)-5-[(tert-butoxycarbonyl)amino]-4-hydroxy-7-methyloct-2-ynoate

(4S,5S)-N-Boc-5-(2-cyanoethyl)-2,2-dimethyl-4-(2-methylpropyl)-1,3-oxazolidine

(4S,5S)-N-Boc-5-(carbethoxymethyl)-2,2-dimethyl-4-(2-methylpropyl)-1,3-oxazolidine

(4S,5S)-5-(2-Carboxy-ethyl)-4-isobutyl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester