(1R,3R)-acetic acid 3-benzyloxycarbonylamino-1-carbamoyl-4-methylpentyl ester

(4S)-4-benzyloxycarbonylamino-5-methylhex-2-enoic acid methyl ester

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

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

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