(5S,1'S)-5-<1'--3'-methylbutyl>dihydrofuran-2(3H)-one

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

(2R,4S,5S)-5-tert-Butoxycarbonylamino-4-hydroxy-2,7-dimethyl-octanoic acid