(2R,4R)-4-benzyloxycarbonylamino-2-hydroxy-5-methylhexanoic acid methyl ester

(4R)-4-benzyloxycarbonylamino-5-methylhexanoic acid methyl ester

(1R,3S)-(1-benzyl-4-hydroxy-3-methylbutyl)carbamic acid tert-butyl ester

(1'R,2'R)-[1-(2-carbamoyl-2-hydroxyethyl)-2-methylpropyl]carbamic acid benzyl ester

(1R,3R)-acetic acid 3-benzyloxycarbonylamino-4-methyl-1-thiocarbamoylpentyl ester